tag:blogger.com,1999:blog-40400674785063079052024-02-20T06:16:38.455+00:00Terahertz Spectroscopy and Imaging TeraViewhttp://www.blogger.com/profile/07614826127686100153noreply@blogger.comBlogger756125tag:blogger.com,1999:blog-4040067478506307905.post-28859970829978461862023-01-31T17:12:00.001+00:002023-01-31T17:12:00.203+00:00Formulation-dependent stability mechanisms affecting dissolution performance of directly compressed griseofulvin tablets<p style="text-align: justify;"><span style="font-family: verdana;"> <span style="background-color: white; color: #222222;">Maclean, Natalie, Ibrahim Khadra, James Mann, Alexander Abbott, Heather Mead, and Daniel Markl. "Formulation-dependent stability mechanisms affecting dissolution performance of directly compressed griseofulvin tablets." </span><i style="background-color: white; color: #222222;">International Journal of Pharmaceutics</i><span style="background-color: white; color: #222222;"> 631 (2023): 122473.</span></span></p><p style="text-align: justify;"><span style="font-family: verdana;">full paper can be found at</span></p><p style="text-align: justify;"><a href="https://www.sciencedirect.com/science/article/pii/S0378517322010286"><span style="font-family: verdana;">https://www.sciencedirect.com/science/article/pii/S0378517322010286</span></a></p><h2 class="section-title u-h3 u-margin-l-top u-margin-xs-bottom" style="box-sizing: border-box; color: #505050; line-height: 1.333 !important; margin-bottom: 8px !important; margin-left: 0px; margin-right: 0px; margin-top: 32px !important; padding: 0px; text-align: justify;"><span style="font-family: verdana; font-size: small;">Abstract</span></h2><div id="d1e647" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px;"><p id="d1e648" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: justify;"><span style="font-family: verdana;">During drug product development, stability studies are used to ensure that the safety and efficacy of a product are not affected during storage. Any change in the dissolution performance of a product must be investigated, as this may indicate a change in the bioavailability. In this study, three different griseofulvin formulations were prepared containing microcrystalline cellulose (MCC) with either mannitol, lactose monohydrate, or dibasic calcium phosphate anhydrous (DCPA). The tensile strength, porosity, contact angle, disintegration time, and dissolution rate were measured after storage under five different accelerated temperature and humidity conditions for 1, 2, and 4 weeks. The dissolution rate was found to decrease after storage for all three batches, with the change in dissolution rate strongly correlating with the storage humidity. The changes in physical properties of each formulation were found to relate to either the premature swelling (MCC/DCPA, MCC/lactose) or dissolution (MCC/mannitol) of particles during storage. These results are also discussed with consideration of the performance- and stability-controlling mechanisms of placebo tablets of the same formulations (Maclean et al., 2021; Maclean et al., 2022).</span></p><p id="d1e648" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: justify;"><span style="font-family: verdana;"><b>Terahertz spectroscopy</b></span></p><p id="d1e1209" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: justify;"><span style="font-family: verdana;">Terahertz time-domain spectroscopy was performed using a <a href="http://www.teraview.com" target="_blank">TeraPulse Lx</a> Spectrometer (TeraView Ltd). The sample chamber was purged with nitrogen to remove moisture from the air during analysis. Samples were analysed using an optical delay of 200 ps and 30 averages. From the terahertz measurements, the refractive index and loss coefficient were obtained. Based on the spectra obtained, a frequency of 0.8 THz was selected for comparing the change in refractive index and loss coefficient across different conditions and timepoints. This frequency was selected as this point was free from peaks (caused by the tablet components) for all formulations.</span></p></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-29809179521179221272023-01-30T17:08:00.004+00:002023-01-30T17:08:00.190+00:00Visible-Terahertz Refractive Indices Correlation in Sodium Borosilicate Glasses<p><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">Tostanoski, Nicholas J., and S. K. Sundaram. "Visible-Terahertz Refractive Indices Correlation in Sodium Borosilicate Glasses." </span><i style="background-color: white; color: #222222;">Journal of Infrared, Millimeter, and Terahertz Waves</i><span style="background-color: white; color: #222222;"> (2022): 1-20.</span></span></p><p><span style="font-family: verdana;"><span style="background-color: white; color: #222222;"><br /></span></span></p><p><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">for full paper see </span></span><span style="color: #222222; font-family: verdana;"><a href="https://link.springer.com/article/10.1007/s10762-022-00900-3">https://link.springer.com/article/10.1007/s10762-022-00900-3</a></span></p><div><span style="font-family: verdana;"><br /></span></div><div><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Abs1" style="background-color: #fcfcfc; border-bottom: 2px solid rgb(213, 213, 213); box-sizing: inherit; color: #333333; line-height: 1.24; margin: 0px; padding-bottom: 8px;"><span style="font-family: verdana; font-size: small;">Abstract</span></h2><div class="c-article-section__content" id="Abs1-content" style="background-color: #fcfcfc; box-sizing: inherit; color: #333333; margin: 0px 0px 40px; padding: 8px 0px 0px;"><p style="box-sizing: inherit; line-height: 1.8; margin: 0px; overflow-wrap: break-word; padding: 0px; word-break: break-word;"><span style="font-family: verdana;">We report visible-terahertz (THz) refractive indices correlation in the sodium borosilicate glass system along two tie lines, NaBSi and BNaSi. The NaBSi series represents the substitution of silicon dioxide for boron oxide, and the BNaSi series, the substitution of silicon dioxide for sodium oxide. Raman spectroscopy was used to provide insight into glass structure with an emphasis placed on properties including physical, e.g., density (ρ), thermal, e.g., glass transition temperature (T<span style="bottom: -0.25em; box-sizing: inherit; line-height: 0; position: relative; vertical-align: baseline;">g</span>), and optical, e.g., refractive indices and dispersion at visible and THz frequencies. A prism coupler system equipped with multiple visible wavelength laser sources and terahertz time-domain spectroscopy (THz-TDS) were used to record refractive indices at visible and THz frequencies, respectively. Sodium borosilicate glasses with a depolymerized glass network, <i style="box-sizing: inherit;">R</i> > 0.5, consisting of charge deficient [BØ<span style="bottom: -0.25em; box-sizing: inherit; line-height: 0; position: relative; vertical-align: baseline;">4</span>]<span style="box-sizing: inherit; line-height: 0; position: relative; top: -0.5em; vertical-align: baseline;">−</span> borate and Q<span style="box-sizing: inherit; line-height: 0; position: relative; top: -0.5em; vertical-align: baseline;">4</span> silicate tetrahedra forming borosilicate ring units with mixed Si–O–B bridges, and formation and increased quantities of Q<span style="box-sizing: inherit; line-height: 0; position: relative; top: -0.5em; vertical-align: baseline;">3</span> silicate tetrahedra with more polarizable non-bridging oxygen (nbO) atoms are responsible for higher measurable refractive indices in these frequencies. This work shows that a linear correlation exists between refractive indices across these frequencies. Additionally, depolymerized glass networks record larger density, glass transition temperature, and optical basicity values. In terms of glass structure, refractive indices of depolymerized or polymerized networks measured at 0.589 μm and 0.5 THz support the correlation, which will be useful for developing active and passive components for applications across these frequencies.</span></p></div></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-49571189704466820552023-01-27T15:51:00.002+00:002023-01-27T15:51:49.588+00:00Terahertz Spectroscopic Characterization and Thickness Evaluation of Internal Delamination Defects in GFRP Composites<p style="text-align: justify;"><span style="font-family: verdana;"> <span style="background-color: white; color: #222222;">Nsengiyumva, Walter, Shuncong Zhong, Manting Luo, and Bing Wang. "Terahertz Spectroscopic Characterization and Thickness Evaluation of Internal Delamination Defects in GFRP Composites." </span><i style="background-color: white; color: #222222;">Chinese Journal of Mechanical Engineering</i><span style="background-color: white; color: #222222;"> 36, no. 1 (2023): 1-21.</span></span></p><p style="text-align: justify;"><span style="background-color: #fcfcfc; color: #333333; font-family: verdana;">Abstract</span></p><div class="c-article-section__content" id="Abs1-content" style="background-color: #fcfcfc; box-sizing: inherit; color: #333333; margin: 0px 0px 40px; padding: 8px 0px 0px;"><p style="box-sizing: inherit; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify; word-break: break-word;"><span style="font-family: verdana;"><br />The use of terahertz time-domain spectroscopy (THz-TDS) for the nondestructive testing and evaluation (NDT&E) of materials and structural systems has attracted significant attention over the past two decades due to its superior spatial resolution and capabilities of detecting and characterizing defects and structural damage in non-conducting materials. In this study, the THz-TDS system is used to detect, localize and evaluate hidden multi-delamination defects (i.e., a three-level multi-delamination system) in multilayered GFRP composite laminates. To obtain accurate results, a wavelet shrinkage de-noising algorithm is used to remove the noise from the measured time-of-flight (TOF) signals. The thickness and location of each delamination defect in the <i style="box-sizing: inherit;">z</i>-direction (i.e., through-the-thickness direction) are calculated from the de-noised TOF signals considering the interaction between the pulsed THz waves and the different interfaces in the GFRP composite laminates. A comparison between the actual and the measured thickness values of the delamination defects before and after the wavelet shrinkage denoising process indicates that the latter provides better results with less than 3.712% relative error, while the relative error of the non-de-noised signals reaches 16.388%. Also, the power and absorbance levels of the THz waves at every interface with different refractive indices in the GFRP composite laminates are evaluated based on analytical and experimental approaches. The present study provides an adequate theoretical analysis that could help NDT&E specialists to estimate the maximum thickness of GFRP composite materials and/or structures with different interfaces that can be evaluated by the THz-TDS. Also, the accuracy of the obtained results highlights the capabilities of the THz-TDS for the NDT&E of multilayered GFRP composite laminates.</span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: verdana;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEjfJI3OKEcB4BkhlrZIMhNxpSV7Gy74KKYN7qIvG3oev0zWrEi8RsDpt37Mnoh8lqNODsrRCPogaNS1TCFTS2CHR7mcJAKca-7FqtP6Yi5ABaaMuVgL8qCgWn0IfkNu2lJrruWKgDHm0TRSWQvyQm9d4cZAo7O3TFSPMO4hntpMkSW5Wll2BEl1SWF0" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="393" data-original-width="685" height="184" src="https://blogger.googleusercontent.com/img/a/AVvXsEjfJI3OKEcB4BkhlrZIMhNxpSV7Gy74KKYN7qIvG3oev0zWrEi8RsDpt37Mnoh8lqNODsrRCPogaNS1TCFTS2CHR7mcJAKca-7FqtP6Yi5ABaaMuVgL8qCgWn0IfkNu2lJrruWKgDHm0TRSWQvyQm9d4cZAo7O3TFSPMO4hntpMkSW5Wll2BEl1SWF0" width="320" /></a></span></div><p></p><p style="box-sizing: inherit; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify; word-break: break-word;"><span style="font-family: verdana;"><br /></span></p><h3 class="c-article__sub-heading" id="Sec9" style="box-sizing: inherit; color: #222222; font-weight: 400; line-height: 1.3; margin: 0px 0px 8px; text-align: justify;"><span style="font-family: verdana; font-size: small;"><br /></span></h3><h3 class="c-article__sub-heading" id="Sec9" style="box-sizing: inherit; color: #222222; line-height: 1.3; margin: 0px 0px 8px; text-align: justify;"><span style="font-family: verdana; font-size: small;">THz-TDS and Imaging System</span></h3><p style="box-sizing: inherit; margin: 0px 0px 1.5em; overflow-wrap: break-word; padding: 0px; text-align: justify; word-break: break-word;"><span style="font-family: verdana;">The THz-TDS (<a href="http://www.teraview.com" target="_blank">TeraView TPS 4000)</a> is used to detect and characterize hidden delamination defects in GFRP composite samples. To measure the optical parameters and characterize the delamination defects of the GFRP samples, the system is configured to perform tests in reflection and transmission modes. These two modes are not simultaneously configured but rather one is configured after the other depending on which mode is needed at the different stages of the study. This THz-TDS system features a scanning range of up to 1200 ps and its resolution can reach 0.1 ps at a rapid scanning frequency of 50 Hz.</span></p><p style="box-sizing: inherit; margin: 0px 0px 1.5em; overflow-wrap: break-word; padding: 0px; text-align: left; word-break: break-word;"><span style="font-family: verdana;">Full paper can be seen at</span></p><p style="box-sizing: inherit; margin: 0px 0px 1.5em; overflow-wrap: break-word; padding: 0px; text-align: left; word-break: break-word;"><span style="font-family: verdana;"> <a href="https://cjme.springeropen.com/articles/10.1186/s10033-022-00829-7">https://cjme.springeropen.com/articles/10.1186/s10033-022-00829-7</a></span></p></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-29474067699365014852023-01-26T05:02:00.000+00:002023-01-26T05:02:05.600+00:00Novel copper borate ceramics with lithium-based sintering aids for LTCC terahertz applications<div style="margin-top: 0px; text-align: left;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">Szwagierczak, Dorota, Beata Synkiewicz-Musialska, Jan Kulawik, Elżbieta Czerwińska, and Norbert Pałka. "Novel copper borate ceramics with lithium-based sintering aids for LTCC terahertz applications." </span><i style="background-color: white; color: #222222;">Journal of Materials Chemistry C</i><span style="background-color: white; color: #222222;"> (2023).</span></span></div><div style="margin-top: 0px; text-align: left;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;"><br /></span><b>Abstract</b></span></div><div style="margin-top: 0px; text-align: left;"><span style="font-family: verdana;"><br />Novel CuB<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">2</span></small>O<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">4</span></small>–Cu<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">3</span></small>B<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">2</span></small>O<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">6</span></small> substrates doped with three Li-based sintering aids, Li<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">2</span></small>WO<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">4</span></small>, LiBO<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">2</span></small> and Li<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">2</span></small>CO<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">3</span></small>, were prepared using the LTCC (low temperature cofired ceramic) technology. The main goals of the work were to confirm the feasibility of LTCC substrates based on the developed materials and to prove their good dielectric properties in a broad terahertz frequency range. The comprehensive characterization of the thermal, compositional, microstructural, and dielectric properties of the fabricated ceramics was carried out by hot-stage microscopy, thermal analysis, dilatometry, X-ray diffractometry, optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, and time domain spectroscopy. The ceramic powders were used for the preparation of slurries and tape casting of proprietary green tapes. Test LTCC multilayer structures with embedded conductors were fabricated. The developed ceramics doped with Li<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">2</span></small>WO<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">4</span></small> and LiBO<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">2</span></small> seem to be very good candidates for LTCC substrates in THz applications. These substrates demonstrate a low sintering temperature 860–880 °C, a low dielectric permittivity 5.4–5.7 and a low loss tangent 0.008–0.01 at 1 THz, as well as a low thermal expansion coefficient of 5.7 ppm °C<small><span style="position: relative; top: -0.4em; vertical-align: baseline;">−1</span></small>, quite well fitted to silicon, and a high flexural strength.</span></div><div style="margin-top: 0px; text-align: left;"><span style="font-family: verdana;"><br /></span></div><div style="margin-top: 0px; text-align: left;"><span style="font-family: verdana;">for full paper see </span></div><div style="margin-top: 0px; text-align: left;"><span style="font-family: verdana;"><a href="https://pubs.rsc.org/en/content/articlelanding/2023/tc/d2tc04429c/unauth">https://pubs.rsc.org/en/content/articlelanding/2023/tc/d2tc04429c/unauth</a></span></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-72861842337514273642022-11-14T13:47:00.000+00:002022-11-14T13:47:00.198+00:00Structure-terahertz property relationship in tellurite glasses<div style="text-align: left;"> <span style="font-family: verdana;"><span style="background-color: white; color: #222222;">Tostanoski, Nicholas J., and S. K. Sundaram. "Structure-terahertz property</span></span></div><div style="text-align: left;"><span style="background-color: white; color: #222222; font-family: verdana;"> relationship in tellurite glasses." </span><i style="background-color: white; color: #222222; font-family: verdana;">Applied Physics A</i><span style="background-color: white; color: #222222; font-family: verdana;"> 128, no. 11 (2022): 1-13.</span></div><div style="text-align: left;"><span style="background-color: white; color: #222222; font-family: verdana;"><br /></span></div><div style="text-align: justify;"><span style="font-family: verdana;"><span style="background-color: #fcfcfc; color: #333333;">Structure-terahertz (THz) property relationship for sodium tungsten tellurite (NWT) and lanthanum tungsten tellurite (LWT) glass systems is reported and is the first of its kind for non-silicate oxide glasses. Raman spectroscopy was used to determine structural units, connectivity, and glass network. Terahertz time-domain spectroscopy (THz-TDS) was used to record the THz refractive index, </span><i style="background-color: #fcfcfc; box-sizing: inherit; color: #333333;">n</i><span style="background-color: #fcfcfc; color: #333333;">(THz), at 0.502 THz. NWT and LWT glasses record higher measurable </span><i style="background-color: #fcfcfc; box-sizing: inherit; color: #333333;">n</i><span style="background-color: #fcfcfc; color: #333333;">(THz) correlated to a glass network with substantial TeO</span><span style="background-color: #fcfcfc; bottom: -0.25em; box-sizing: inherit; color: #333333; line-height: 0; position: relative; vertical-align: baseline;">2</span><span style="background-color: #fcfcfc; color: #333333;"> and WO</span><span style="background-color: #fcfcfc; bottom: -0.25em; box-sizing: inherit; color: #333333; line-height: 0; position: relative; vertical-align: baseline;">3</span><span style="background-color: #fcfcfc; color: #333333;"> content with mixed Te–O–W linkages and TeO</span><span style="background-color: #fcfcfc; bottom: -0.25em; box-sizing: inherit; color: #333333; line-height: 0; position: relative; vertical-align: baseline;">2</span><span style="background-color: #fcfcfc; color: #333333;">- or WO</span><span style="background-color: #fcfcfc; bottom: -0.25em; box-sizing: inherit; color: #333333; line-height: 0; position: relative; vertical-align: baseline;">3</span><span style="background-color: #fcfcfc; color: #333333;">-rich content with homonuclear Te–O–Te or W–O–W linkages, respectively. Concurrent examination revealed three distinct regions of </span><i style="background-color: #fcfcfc; box-sizing: inherit; color: #333333;">n</i><span style="background-color: #fcfcfc; color: #333333;">(THz).</span></span></div><div style="text-align: left;"><span style="background-color: #fcfcfc; color: #333333;"><span style="font-family: verdana;"><br /></span></span><span style="font-family: verdana;"><span style="background-color: #fcfcfc; color: #333333;">for full paper see </span><span style="color: #333333;">https://link.springer.com/article/10.1007/s00339-022-06148-x</span></span></div><p style="text-align: left;"><span style="background-color: white; color: #222222; font-family: Arial, sans-serif; font-size: 13px;"><br /></span></p><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-6284117625244744792022-11-11T12:36:00.007+00:002022-11-11T12:36:58.416+00:00New TeraSolve system from TeraView for the analysis of the porosity of Solid dosage forms <p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhXw80KN0l3dIQ7GXvdJUm69PYDxF0A2yFEriYLEAcpdYIirtMEmwTcyR5NPqaKUGH1JSryNZFXjeSkd0JIJttZ5jJbBAxn_QgY_AXjVfdZSDb8UdgYZ8BtDN8HAE564Zz74EqPwHv33meBr4FBxLnup3_BbiwvC0sWIuhfcY_RK24ff0MnGUctsV4L" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="1385" data-original-width="2000" height="259" src="https://blogger.googleusercontent.com/img/a/AVvXsEhXw80KN0l3dIQ7GXvdJUm69PYDxF0A2yFEriYLEAcpdYIirtMEmwTcyR5NPqaKUGH1JSryNZFXjeSkd0JIJttZ5jJbBAxn_QgY_AXjVfdZSDb8UdgYZ8BtDN8HAE564Zz74EqPwHv33meBr4FBxLnup3_BbiwvC0sWIuhfcY_RK24ff0MnGUctsV4L=w374-h259" width="374" /></a></div><p><br /></p><div style="text-align: justify;"><span style="font-family: verdana;"><span class="css-901oao css-16my406 r-poiln3 r-bcqeeo r-qvutc0" style="background-color: rgba(0, 0, 0, 0.03); border: 0px solid black; box-sizing: border-box; color: #0f1419; display: inline; font-stretch: inherit; font-variant-east-asian: inherit; font-variant-numeric: inherit; line-height: inherit; margin: 0px; min-width: 0px; overflow-wrap: break-word; padding: 0px; white-space: pre-wrap;">There is a clear need for a robust process </span><span class="r-18u37iz" style="-webkit-box-direction: normal; -webkit-box-orient: horizontal; background-color: rgba(0, 0, 0, 0.03); color: #0f1419; flex-direction: row; white-space: pre-wrap;"><a class="css-4rbku5 css-18t94o4 css-901oao css-16my406 r-1cvl2hr r-1loqt21 r-poiln3 r-bcqeeo r-qvutc0" dir="ltr" href="https://twitter.com/hashtag/analytical?src=hashtag_click" role="link" style="background-color: rgba(0, 0, 0, 0); border: 0px solid black; box-sizing: border-box; color: #1d9bf0; cursor: pointer; display: inline; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; list-style: none; margin: 0px; min-width: 0px; overflow-wrap: break-word; padding: 0px; text-align: inherit; text-decoration-line: none; white-space: inherit;">#analytical</a></span><span class="css-901oao css-16my406 r-poiln3 r-bcqeeo r-qvutc0" style="background-color: rgba(0, 0, 0, 0.03); border: 0px solid black; box-sizing: border-box; color: #0f1419; display: inline; font-stretch: inherit; font-variant-east-asian: inherit; font-variant-numeric: inherit; line-height: inherit; margin: 0px; min-width: 0px; overflow-wrap: break-word; padding: 0px; white-space: pre-wrap;"> technology tool that can be used for </span><span class="r-18u37iz" style="-webkit-box-direction: normal; -webkit-box-orient: horizontal; background-color: rgba(0, 0, 0, 0.03); color: #0f1419; flex-direction: row; white-space: pre-wrap;"><a class="css-4rbku5 css-18t94o4 css-901oao css-16my406 r-1cvl2hr r-1loqt21 r-poiln3 r-bcqeeo r-qvutc0" dir="ltr" href="https://twitter.com/hashtag/online?src=hashtag_click" role="link" style="background-color: rgba(0, 0, 0, 0); border: 0px solid black; box-sizing: border-box; color: #1d9bf0; cursor: pointer; display: inline; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; list-style: none; margin: 0px; min-width: 0px; overflow-wrap: break-word; padding: 0px; text-align: inherit; text-decoration-line: none; white-space: inherit;">#online</a>/ </span><span style="background-color: rgba(0, 0, 0, 0.03); color: #0f1419; white-space: pre-wrap;">inline prediction of dissolution and disintegration characteristics of pharmaceutical tablets during manufacture.</span></span></div><div style="text-align: left;"><div style="text-align: justify;"><span style="color: #0f1419; font-family: verdana; white-space: pre-wrap;"><br /></span></div><span style="font-family: verdana;"><div style="text-align: justify;"><a href="https://www.sciencedirect.com/science/article/abs/pii/S0022354920307796" style="white-space: pre-wrap;">https://www.sciencedirect.com/science/article/abs/pii/S0022354920307796</a></div></span></div><div style="text-align: left;"><div style="text-align: justify;"><span style="color: #0f1419; font-family: verdana; white-space: pre-wrap;"><br /></span></div><span style="font-family: verdana;"><div style="text-align: justify;"><span class="css-901oao css-16my406 r-poiln3 r-bcqeeo r-qvutc0" style="background-color: rgba(0, 0, 0, 0.03); border: 0px solid black; box-sizing: border-box; display: inline; font-stretch: inherit; font-variant-east-asian: inherit; font-variant-numeric: inherit; line-height: inherit; margin: 0px; min-width: 0px; overflow-wrap: break-word; padding: 0px;">Water ingress into tablets is known to be highly influenced by the microstructure of the tablet, particularly tablet </span><span class="r-18u37iz" style="-webkit-box-direction: normal; -webkit-box-orient: horizontal; background-color: rgba(0, 0, 0, 0.03); color: #0f1419; flex-direction: row; white-space: pre-wrap;"><a class="css-4rbku5 css-18t94o4 css-901oao css-16my406 r-1cvl2hr r-1loqt21 r-poiln3 r-bcqeeo r-qvutc0" dir="ltr" href="https://twitter.com/hashtag/porosity?src=hashtag_click" role="link" style="background-color: rgba(0, 0, 0, 0); border: 0px solid black; box-sizing: border-box; color: #1d9bf0; cursor: pointer; display: inline; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; list-style: none; margin: 0px; min-width: 0px; overflow-wrap: break-word; padding: 0px; text-align: inherit; text-decoration-line: none; white-space: inherit;">#porosity</a></span><span class="css-901oao css-16my406 r-poiln3 r-bcqeeo r-qvutc0" style="background-color: rgba(0, 0, 0, 0.03); border: 0px solid black; box-sizing: border-box; color: #0f1419; display: inline; font-stretch: inherit; font-variant-east-asian: inherit; font-variant-numeric: inherit; line-height: inherit; margin: 0px; min-width: 0px; overflow-wrap: break-word; padding: 0px; white-space: pre-wrap;">.</span></div></span></div><div style="text-align: left;"><div style="text-align: justify;"><span style="background-color: rgba(0, 0, 0, 0.03); color: #0f1419; font-family: verdana; white-space: pre-wrap;"> </span></div><span style="font-family: verdana;"><div style="text-align: justify;"><span style="background-color: rgba(0, 0, 0, 0.03); color: #0f1419; white-space: pre-wrap;">see </span><a href="https://www.sciencedirect.com/science/article/abs/pii/S0378517320306293" style="white-space: pre-wrap;">https://www.sciencedirect.com/science/article/abs/pii/S0378517320306293</a></div><span class="r-18u37iz" style="-webkit-box-direction: normal; -webkit-box-orient: horizontal; background-color: rgba(0, 0, 0, 0.03); color: #0f1419; flex-direction: row; white-space: pre-wrap;"><div style="text-align: justify;"><span class="r-18u37iz" style="-webkit-box-direction: normal; -webkit-box-orient: horizontal; flex-direction: row;"><a class="css-4rbku5 css-18t94o4 css-901oao css-16my406 r-1cvl2hr r-1loqt21 r-poiln3 r-bcqeeo r-1ny4l3l r-1ddef8g r-tjvw6i r-qvutc0" dir="ltr" href="https://twitter.com/hashtag/Porosity?src=hashtag_click" role="link" style="background-color: rgba(0, 0, 0, 0); border: 0px solid black; box-sizing: border-box; color: #1d9bf0; cursor: pointer; display: inline; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; list-style: none; margin: 0px; min-width: 0px; outline-style: none; overflow-wrap: break-word; padding: 0px; text-align: inherit; text-decoration-thickness: 1px; white-space: inherit;">#Porosity</a></span><span class="css-901oao css-16my406 r-poiln3 r-bcqeeo r-qvutc0" style="border: 0px solid black; box-sizing: border-box; display: inline; font-stretch: inherit; font-variant-east-asian: inherit; font-variant-numeric: inherit; line-height: inherit; margin: 0px; min-width: 0px; overflow-wrap: break-word; padding: 0px;">, one of the important quality attributes of pharmaceutical tablets, directly affects the mechanical properties, the mass transport and hence tablet disintegration, dissolution and ultimately the </span><span class="r-18u37iz" style="-webkit-box-direction: normal; -webkit-box-orient: horizontal; flex-direction: row;"><a class="css-4rbku5 css-18t94o4 css-901oao css-16my406 r-1cvl2hr r-1loqt21 r-poiln3 r-bcqeeo r-qvutc0" dir="ltr" href="https://twitter.com/hashtag/bioavailability?src=hashtag_click" role="link" style="background-color: rgba(0, 0, 0, 0); border: 0px solid black; box-sizing: border-box; color: #1d9bf0; cursor: pointer; display: inline; font-stretch: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; line-height: inherit; list-style: none; margin: 0px; min-width: 0px; overflow-wrap: break-word; padding: 0px; text-align: inherit; text-decoration-line: none; white-space: inherit;">#bioavailability</a></span><span class="css-901oao css-16my406 r-poiln3 r-bcqeeo r-qvutc0" style="border: 0px solid black; box-sizing: border-box; display: inline; font-stretch: inherit; font-variant-east-asian: inherit; font-variant-numeric: inherit; line-height: inherit; margin: 0px; min-width: 0px; overflow-wrap: break-word; padding: 0px;"> of an orally administered drug.</span></div></span></span></div><div style="text-align: left;"><div style="text-align: justify;"><span style="color: #0f1419; font-family: verdana; white-space: pre-wrap;"><br /></span></div><span style="font-family: verdana;"><div style="text-align: justify;"><span style="background-color: rgba(0, 0, 0, 0.03); color: #0f1419; white-space: pre-wrap;">see </span><a href="https://link.springer.com/article/10.1007/s10762-019-00659-0" style="white-space: pre-wrap;">https://link.springer.com/article/10.1007/s10762-019-00659-0</a></div></span></div><div style="text-align: left;"><div style="text-align: justify;"><span style="color: #0000ee; font-family: verdana; text-decoration-line: underline; white-space: pre-wrap;"><br /></span></div><span style="font-family: verdana;"><div style="text-align: justify;">For more information contact us at <a href="https://teraview.com/get-in-touch/">https://teraview.com/get-in-touch/</a></div></span></div><p></p><p style="text-align: left;"><br /></p><p><br /></p><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-42595342175591878632022-11-10T13:44:00.014+00:002022-11-10T13:44:00.185+00:00Soft Defect Localization and Characterization for Advanced IC Packaging Using Novel EOTPR In-Situ Dynamic Temperature Probing<p><span style="font-family: verdana;"> <span style="background-color: white; color: #222222;">Ko, Zhi Hao, Tom White, Jesse Alton, and Martin Igarashi. "Soft Defect Localization and Characterization for Advanced IC Packaging Using Novel EOTPR In-Situ Dynamic Temperature Probing." In </span><i style="background-color: white; color: #222222;">ISTFA 2022</i><span style="background-color: white; color: #222222;">, pp. 289-293. ASM International, 2022.</span></span></p><p><span style="background-color: white; color: #222222;"><span style="font-family: verdana;"><br /></span></span></p><p style="text-align: justify;"><span style="background-color: white; color: #1a1a1a;"><span style="font-family: verdana;">The high temperatures and thermal cycling experienced by integrated circuit packages can induce warpage that in turn can lead to cracks developing at material interfaces that compromise the integrity of electrical traces within the device. In this study, the authors demonstrate how <a href="http://www.teraview.com">Electro-Optical Terahertz Pulsed Reflectometry (EOTPR)</a> with dynamic temperature control can be used to localize and characterize the resistive faults created by such thermally induced cracks. The EOTPR technique provides quick, reliable, and accurate results, and it allows automatic probing that can be used to generate defect maps for further root cause analysis. The approach demonstrated in this paper shows the significant potential of EOTPR in soft failure characterization and in failure and reliability analysis.</span></span></p><p style="text-align: justify;"><span style="background-color: white; color: #1a1a1a;"><span style="font-family: verdana;"><br /></span></span></p><p><span style="font-family: verdana;"><span style="background-color: white; color: #1a1a1a;">for full paper see </span></span></p><p><span style="font-family: verdana;"><span style="color: #1a1a1a;"><a href="https://dl.asminternational.org/istfa/proceedings/ISTFA2022/289/23926">https://dl.asminternational.org/istfa/proceedings/ISTFA2022/289/23926</a></span></span></p><p><span style="background-color: white; color: #222222; font-family: Arial, sans-serif; font-size: 13px;"><br /></span></p><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-9307962474118581722022-11-09T13:41:00.019+00:002022-11-09T13:41:00.193+00:00Special Role of Mg2+ in the Formation of the Hydration Shell of Adenosine Triphosphate<div style="line-height: 12.75pt; text-align: left;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">Penkov, N. V., N. A. Penkova, and V. I. Lobyshev. "Special Role of Mg2+ in the Formation of the Hydration Shell of Adenosine Triphosphate." </span><i style="background-color: white; color: #222222;">Physics of Wave Phenomena</i><span style="background-color: white; color: #222222;"> 30, no. 5 (2022): 344-350.</span></span></div><div style="line-height: 12.75pt; text-align: left;"><span style="font-family: verdana;"><span style="color: #222222;"><br /></span><b>Abstract</b></span></div><div style="line-height: 12.75pt; text-align: left;"><span style="font-family: verdana;"><br /><span style="background-color: #fcfcfc; color: #333333;">The hydration of adenosine triphosphate (ATP), Mg · ATP, and Ca · ATP in aqueous solutions has been analyzed based on the Terahertz Time-Domain Spectroscopy and Dynamic Light Scattering data. It is shown that the ATP binding with Mg</span><span style="box-sizing: inherit; color: #333333; line-height: 0; position: relative; top: -0.5em; vertical-align: baseline;">2+</span><span style="background-color: #fcfcfc; color: #333333;"> </span><span style="background-color: #fcfcfc; color: #333333;">or Ca</span><span style="box-sizing: inherit; color: #333333; line-height: 0; position: relative; top: -0.5em; vertical-align: baseline;">2+</span><span style="background-color: #fcfcfc; color: #333333;"> </span><span style="background-color: #fcfcfc; color: #333333;">leads to weakening of water binding in the hydration shell (apparently, due to the screening of the phosphate-group charge). It is also shown that an increased number of hydrogen bonds are formed in the hydration shells of Mg · ATP, which is not the case for ATP and Ca · ATP. The hydrodynamic diameter of Mg · ATP exceeds that of ATP and Ca · ATP, which is in agreement with the conclusion about the larger number of hydrogen bonds in the Mg · ATP hydration shell. The special role of Mg</span><span style="box-sizing: inherit; color: #333333; line-height: 0; position: relative; top: -0.5em; vertical-align: baseline;">2+</span><span style="background-color: #fcfcfc; color: #333333;"> </span><span style="background-color: #fcfcfc; color: #333333;">in the ATP hydration may have a deep biological sense, because ATP is involved in most of biologically significant reactions specifically in the form of Mg · ATP complex.</span></span></div><div style="line-height: 12.75pt; text-align: left;"><span style="font-family: verdana;"><span style="color: #333333;"><br /></span>for full paper see <a href="https://link.springer.com/article/10.3103/S1541308X22050090">https://link.springer.com/article/10.3103/S1541308X22050090</a> </span></div><div style="line-height: 12.75pt; text-align: left;"><span style="font-family: verdana;"><br /><span style="color: #222222;">… The spectra in the THz range were recorded on a <a href="http://www.teraview.com" target="_blank">TPS Spectra3000</a> (<b><a href="http://www.teraview.com" target="_blank">Teraview</a></b>, UK) spectrometer. The THz-TDS method is known in detail; its description can be found, eg, in [29]. This method makes it possible to record simultaneously
the …</span></span></div><p style="text-align: left;"><br /></p><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-38232901713393887352022-11-08T13:38:00.001+00:002022-11-08T13:40:42.210+00:00Time of flight improved thermally grown oxide thickness measurement with terahertz spectroscopy<p> <span face="Verdana, sans-serif" style="background-color: white; color: #222222; text-align: justify;">Zhang, Zhenghao, Yi
Huang, Shuncong Zhong, Tingling Lin, Yujie Zhong, Qiuming Zeng, Walter
Nsengiyumva, Yingjie Yu, and Zhike Peng. "Time of flight improved
thermally grown oxide thickness measurement with<a href="http://teraview.com" target="_blank"> terahertz spectroscopy</a>." </span><i style="color: #222222; font-family: Verdana, sans-serif; text-align: justify;">Frontiers of Mechanical Engineering</i><span face="Verdana, sans-serif" style="background-color: white; color: #222222; text-align: justify;"> 17,
no. 4 (2022): 1-11.</span></p><p><span face="Verdana, sans-serif" style="background-color: white; color: #222222; text-align: justify;">for full paper see </span><span face="Verdana, sans-serif" style="color: #222222;"><a href="https://link.springer.com/article/10.1007/s11465-022-0705-3">https://link.springer.com/article/10.1007/s11465-022-0705-3</a></span></p>
<p style="-webkit-text-stroke-width: 0px; background: rgb(252, 252, 252); box-sizing: inherit; font-variant-caps: normal; font-variant-ligatures: normal; margin-bottom: 18.0pt; margin-left: 0cm; margin-right: 0cm; margin-top: 0cm; margin: 0cm 0cm 18pt; orphans: 2; overflow-wrap: break-word; text-align: justify; text-decoration-color: initial; text-decoration-style: initial; text-decoration-thickness: initial; widows: 2; word-break: break-word; word-spacing: 0px;"><span face=""Verdana",sans-serif" style="color: #333333;">As a
nondestructive testing technique, terahertz time-domain spectroscopy technology
is commonly used to measure the thickness of ceramic coat in thermal barrier
coatings (TBCs). However, the invisibility of ceramic/thermally grown oxide
(TGO) reflective wave leads to the measurement failure of natural growth TGO
whose thickness is below 10 µm in TBCs. To detect and monitor TGO in the
emergence stage, a time of flight (TOF) improved TGO thickness measurement
method is proposed. A simulative investigation on propagation characteristics
of terahertz shows the linear relationship between TGO thickness and phase
shift of feature wave. The accurate TOF increment could be acquired from
wavelet soft threshold and cross-correlation function with negative effect
reduction of environmental noise and system oscillation. Thus, the TGO
thickness could be obtained efficiently from the TOF increment of the monitor
area with different heating times. The averaged error of 1.61 µm in
experimental results demonstrates the highly accurate and robust measurement of
the proposed method, making it attractive for condition monitoring and life
prediction of TBCs.<o:p></o:p></span></p>
<div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><div class="separator" style="clear: both; text-align: center;"><div class="separator" style="clear: both; text-align: center;"><br /></div><br /><br /></div><br /><br /></div><br /><br /><br /><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-80901959451358357192022-07-25T14:23:00.001+01:002022-07-25T14:23:00.174+01:00Single-particle and collective excitations of polar water molecules confined in nano-pores within a cordierite crystal lattice<p><span style="font-family: verdana;"> <span style="background-color: white; color: #222222;">Belyanchikov, M. A., Z. V. Bedran, M. Savinov, P. Bednyakov, P. Proschek, J. Prokleska, V. A. Abalmasov et al. "Single-particle and collective excitations of polar water molecules confined in nano-pores within a cordierite crystal lattice." </span><i style="background-color: white; color: #222222;">Physical Chemistry Chemical Physics</i><span style="background-color: white; color: #222222;"> 24, no. 11 (2022): 6890-6904.</span></span></p><p><span style="background-color: white; color: rgba(0, 0, 0, 0.9); font-family: verdana; letter-spacing: -0.03em;"><b>Abstract</b></span></p><div class="capsule__column-wrapper" style="background-color: white; color: rgba(0, 0, 0, 0.79);"><div class="capsule__text" style="margin: 8px 0px;"><p style="margin-top: 0px;" xmlns="http://www.rsc.org/schema/rscart38"><span style="font-family: verdana;"></span></p><div class="capsule__article-image fixpadv--s" style="margin-left: auto; margin-right: auto; max-height: 378px; max-width: 378px; padding: 24px 0px; text-align: center;"><span style="font-family: verdana;"><img alt="Graphical abstract: Single-particle and collective excitations of polar water molecules confined in nano-pores within a cordierite crystal lattice" src="https://pubs.rsc.org/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=D1CP05338H&imageInfo.ImageIdentifier.Year=2022" style="border: none; margin-left: auto; margin-right: auto; max-height: 378px; max-width: 100%;" /></span></div><p></p></div></div><div class="capsule__column-wrapper" style="background-color: white; color: rgba(0, 0, 0, 0.79);"><div class="capsule__text" style="margin: 8px 0px;"><p style="margin-top: 0px;" xmlns="http://www.rsc.org/schema/rscart38"><span style="font-family: verdana;"><br />Recently, the low-temperature phase of water molecules confined within nanocages formed by the crystalline lattice of water-containing cordierite crystals has been reported to comprise domains with ferroelectrically ordered dipoles within the <em>a</em>, <em>b</em>-planes which are antiferroelectrically alternating along the <em>c</em>-axis. In the present work, comprehensive broad-band dielectric spectroscopy is combined with specific heat studies and molecular dynamics and Monte Carlo simulations in order to investigate in more detail the collective modes and single-particle excitations of nanoconfined water molecules. From DFT-MD simulations we reconstruct the potential-energy landscape experienced by the H<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">2</span></small>O molecules. A rich set of anisotropic temperature-dependent excitations is observed in the terahertz frequency range. Their origin is associated with the complex rotational/translational vibrations of confined H<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">2</span></small>O molecules. A strongly temperature dependent relaxational excitation, observed at radio-microwave frequencies for the electric field parallel to the crystallographic <em>a</em>-axis, <em>E</em>||<em>a</em> is analyzed in detail. The temperature dependences of loss-peak frequency and dielectric strength of the excitation together with specific heat data confirm a ferroelectric order–disorder phase transition at <em>T</em><small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">0</span></small> ≈ 3 K in the network of H<small><span style="bottom: -0.4em; position: relative; vertical-align: baseline;">2</span></small>O dipoles. Additional dielectric data are also provided for polarization <em>E</em>||<em>b</em>, too. Overall, these combined experimental investigations enable detailed conclusions concerning the dynamics of the confined water molecules that develop within their microscopic energy landscapes.</span></p><p style="margin-top: 0px;" xmlns="http://www.rsc.org/schema/rscart38"><span style="font-family: verdana;"><br /></span></p><p style="color: black;"><span style="color: #222222;"><span style="font-family: verdana;">for full paper see </span></span></p><p style="color: black;"><span style="color: #222222; font-family: verdana;"><a href="https://pubs.rsc.org/en/content/articlelanding/2022/cp/d1cp05338h/unauth">https://pubs.rsc.org/en/content/articlelanding/2022/cp/d1cp05338h/unauth</a></span></p><p style="color: black;"><br /></p><p class="MsoNormal" style="line-height: 12.75pt;"><span style="color: #222222;"><span style="font-family: verdana;">… For terahertz measurements, a time-domain <a href="http://www.teraview.com"><b>TeraView</b> </a>3000
spectrometer was employed to directly determine the spectra of the real ε' and imaginary ε"
parts of the dielectric permittivity from the complex (amplitude and phase)
transmission …</span><span style="font-family: Arial, sans-serif; font-size: 10pt;"><o:p></o:p></span></span></p><p style="margin-top: 0px;" xmlns="http://www.rsc.org/schema/rscart38"><span style="font-family: verdana;"><br /></span></p><p style="margin-top: 0px;" xmlns="http://www.rsc.org/schema/rscart38"><span style="font-family: verdana;"><br /></span></p><p style="margin-top: 0px;" xmlns="http://www.rsc.org/schema/rscart38"><span style="font-family: verdana;"><br /></span></p></div></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-28627139401223400762022-07-19T14:11:00.001+01:002022-07-19T14:11:00.182+01:00Dispersive Spectrometry At Terahertz Frequencies for Probing the Quality of NbTiN Superconducting Films<p> <span style="background-color: white; color: #222222; font-family: verdana;">Khudchenko, A., B. N. R. Lap, K. I. Rudakov, R. Hesper, V. P. Koshelets, P. N. Dmitriev, A. Chekushkin et al. "Dispersive Spectrometry At Terahertz Frequencies for Probing the Quality of NbTiN Superconducting Films." </span><i style="background-color: white; color: #222222; font-family: verdana;">IEEE Transactions on Applied Superconductivity</i><span style="background-color: white; color: #222222; font-family: verdana;"> 32, no. 4 (2022): 1-6.</span></p><p><span style="font-family: verdana;"><br /></span></p><p><span _ngcontent-akv-c186="" style="background-color: white; color: #333333; font-weight: 700;"><span style="font-family: verdana;">Abstract:</span></span></p><div _ngcontent-akv-c186="" style="background-color: white; color: #333333;" xplmathjax=""><span style="font-family: verdana;">We present the quality measurements of thick (thicker than London penetration depth) NbTiN superconducting films at Terahertz frequencies using a Dispersive Fourier Transform Spectrometer (DFTS). The reflected RF signal from the tested film was measured in time domain, allowing us to separate it from other reflections. The complex conductivity of the film depends on frequency and determines the reflection coefficient. By comparing the film reflection in superconducting state (film temperature below <span class="MathJax" id="MathJax-Element-3-Frame" style="border: 0px; direction: ltr; display: inline; float: none; line-height: normal; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 0px; white-space: nowrap; word-spacing: normal;" tabindex="0"><nobr style="border: 0px; line-height: normal; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; padding: 0px; transition: none 0s ease 0s; vertical-align: 0px;"><span class="math" id="MathJax-Span-9" style="border: 0px; box-sizing: content-box; display: inline-block; line-height: normal; margin: 0px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 1.391em;"><span style="border: 0px; box-sizing: content-box; display: inline-block; height: 0px; line-height: normal; margin: 0px; padding: 0px; position: relative; transition: none 0s ease 0s; vertical-align: 0px; width: 1.16em;"><span style="border: 0px; box-sizing: content-box; clip: rect(1.391em, 1001.16em, 2.363em, -999.998em); left: 0em; line-height: normal; margin: 0px; padding: 0px; position: absolute; top: -2.22em; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mrow" id="MathJax-Span-10" style="border: 0px; box-sizing: content-box; display: inline; line-height: normal; margin: 0px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mi" id="MathJax-Span-11" style="border: 0px; box-sizing: content-box; display: inline; line-height: normal; margin: 0px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">T<span style="border: 0px; box-sizing: content-box; display: inline-block; height: 1px; line-height: normal; margin: 0px; overflow: hidden; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 0.141em;"></span></span><span class="mi" id="MathJax-Span-12" style="border: 0px; box-sizing: content-box; display: inline; line-height: normal; margin: 0px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">c</span></span><span style="border: 0px; box-sizing: content-box; display: inline-block; height: 2.225em; line-height: normal; margin: 0px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 0px;"></span></span></span><span style="border-bottom-style: initial; border-color: initial; border-image: initial; border-left-style: solid; border-right-style: initial; border-top-style: initial; border-width: 0px; box-sizing: content-box; display: inline-block; height: 0.947em; line-height: normal; margin: 0px; overflow: hidden; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: -0.053em; width: 0px;"></span></span></nobr></span>) with that of the normal state (film temperature above <span class="MathJax" id="MathJax-Element-4-Frame" style="border: 0px; direction: ltr; display: inline; float: none; line-height: normal; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 0px; white-space: nowrap; word-spacing: normal;" tabindex="0"><nobr style="border: 0px; line-height: normal; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; padding: 0px; transition: none 0s ease 0s; vertical-align: 0px;"><span class="math" id="MathJax-Span-13" style="border: 0px; box-sizing: content-box; display: inline-block; line-height: normal; margin: 0px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 1.391em;"><span style="border: 0px; box-sizing: content-box; display: inline-block; height: 0px; line-height: normal; margin: 0px; padding: 0px; position: relative; transition: none 0s ease 0s; vertical-align: 0px; width: 1.16em;"><span style="border: 0px; box-sizing: content-box; clip: rect(1.391em, 1001.16em, 2.363em, -999.998em); left: 0em; line-height: normal; margin: 0px; padding: 0px; position: absolute; top: -2.22em; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mrow" id="MathJax-Span-14" style="border: 0px; box-sizing: content-box; display: inline; line-height: normal; margin: 0px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mi" id="MathJax-Span-15" style="border: 0px; box-sizing: content-box; display: inline; line-height: normal; margin: 0px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">T<span style="border: 0px; box-sizing: content-box; display: inline-block; height: 1px; line-height: normal; margin: 0px; overflow: hidden; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 0.141em;"></span></span><span class="mi" id="MathJax-Span-16" style="border: 0px; box-sizing: content-box; display: inline; line-height: normal; margin: 0px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">c</span></span><span style="border: 0px; box-sizing: content-box; display: inline-block; height: 2.225em; line-height: normal; margin: 0px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 0px;"></span></span></span><span style="border-bottom-style: initial; border-color: initial; border-image: initial; border-left-style: solid; border-right-style: initial; border-top-style: initial; border-width: 0px; box-sizing: content-box; display: inline-block; height: 0.947em; line-height: normal; margin: 0px; overflow: hidden; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: -0.053em; width: 0px;"></span></span></nobr></span>), we characterized the film quality at terahertz frequencies, and directly probed the energy of the superconducting gap of the tested film. The experimental results were fitted using the extended Mattis-Bardeen theory and th obtained film parameters show a good agreement with the literature. In addition to the DFTS, we have also measured the properties of NbTiN film using Time Domain Spectroscopy (TDS). It is shown that both TDS and DFTS provide similar results, and both techniques can be used for the quality control of thick NbTiN films. The superconducting gap determined from the measurements by both DFTS and TDS are in good agreement for both solid and meshed films showing that there is no remarkable degradation in the film quality due to technological processes of lift-off or ion etching.</span></div><div _ngcontent-akv-c186="" style="background-color: white; color: #333333;" xplmathjax=""><span style="font-family: verdana;"><br /></span></div><div _ngcontent-akv-c186="" style="background-color: white;" xplmathjax=""><span style="color: #333333; font-family: verdana;">for full paper see </span></div><div _ngcontent-akv-c186="" style="background-color: white;" xplmathjax=""><span style="background-color: transparent;"><span style="color: #333333; font-family: verdana;"><a href="https://ieeexplore.ieee.org/abstract/document/9699055/authors#authors">https://ieeexplore.ieee.org/abstract/document/9699055/authors#authors</a></span></span></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-80356219761608070052022-07-18T14:08:00.003+01:002022-07-18T14:08:35.941+01:00Terahertz-infrared spectroscopy of wafer-scale films of single-walled carbon nanotubes treated by plasma<p><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">Zhukov, S. S., E. S. Zhukova, A. V. Melentev, B. P. Gorshunov, A. P. Tsapenko, D. S. Kopylova, and Albert G. Nasibulin. "Terahertz-infrared spectroscopy of wafer-scale films of single-walled carbon nanotubes treated by plasma." </span><i style="background-color: white; color: #222222;">Carbon</i><span style="background-color: white; color: #222222;"> 189 (2022): 413-421.</span></span></p><p><span style="color: #505050; font-family: verdana;"><b>Abstract</b></span></p><div id="abssec0010" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px;"><p id="abspara0010" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: justify;"><span style="font-family: verdana;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;">We investigated terahertz-infrared electrodynamic properties of wafer-scale films composed of plasma-treated single-walled carbon <a class="topic-link" href="https://www.sciencedirect.com/topics/engineering/nanotubes" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about nanotubes from ScienceDirect's AI-generated Topic Pages">nanotubes</a> (SWCNTs) and films comprising SWCNTs grown with different lengths. The spectra of complex conductance of the films were measured at frequencies 5–20 000 cm</span><span style="box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; top: -0.5em; vertical-align: baseline;">−1</span><span style="box-sizing: border-box; margin: 0px; padding: 0px;"> and in the temperature interval 5–300 K. <a href="http://www.teraview.com">Terahertz </a><a class="topic-link" href="https://www.sciencedirect.com/topics/engineering/spectral-sensitivity" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about spectral response from ScienceDirect's AI-generated Topic Pages">spectral response</a><span style="box-sizing: border-box; margin: 0px; padding: 0px;"> of films of pristine SWCNTs is well described with the Drude <a class="topic-link" href="https://www.sciencedirect.com/topics/materials-science/conductivity" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about conductivity from ScienceDirect's AI-generated Topic Pages">conductivity</a> model and a plasmon resonance located at ≈100 cm</span></span><span style="box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; top: -0.5em; vertical-align: baseline;">−1</span>. Stepwise treatment of the films with oxygen plasma led to a gradual suppression of the Drude spectral weight from the low-frequency side. For films with the nanotubes shorter than 1 μm, <em style="box-sizing: border-box; margin: 0px; padding: 0px;">i</em>.<em style="box-sizing: border-box; margin: 0px; padding: 0px;">e</em><span style="box-sizing: border-box; margin: 0px; padding: 0px;">., close to electrons <a class="topic-link" href="https://www.sciencedirect.com/topics/engineering/mean-free-path" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about mean free path from ScienceDirect's AI-generated Topic Pages">mean free path</a><span style="box-sizing: border-box; margin: 0px; padding: 0px;"> and <a class="topic-link" href="https://www.sciencedirect.com/topics/engineering/localisation" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about localization from ScienceDirect's AI-generated Topic Pages">localization</a><span style="box-sizing: border-box; margin: 0px; padding: 0px;"> length, scattering of charge carriers at the nanotubes edges is shown to additionally contribute to the carriers scattering rate and to the damping of plasmon resonance. The <a class="topic-link" href="https://www.sciencedirect.com/topics/engineering/temperature-coefficient" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about temperature coefficient from ScienceDirect's AI-generated Topic Pages">temperature coefficient</a><span style="box-sizing: border-box; margin: 0px; padding: 0px;"> of <a class="topic-link" href="https://www.sciencedirect.com/topics/engineering/ac-resistance" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about ac resistance from ScienceDirect's AI-generated Topic Pages">ac resistance</a><span style="box-sizing: border-box; margin: 0px; padding: 0px;"> (ac TCR) in both kinds of films is found to strongly increase in amplitude during cooling and frequency decrease. The values of ac TCR increase in films with longer time of <a class="topic-link" href="https://www.sciencedirect.com/topics/engineering/plasma-treatment" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about plasma treatment from ScienceDirect's AI-generated Topic Pages">plasma treatment</a> and nanotubes with shorter length but reach saturation in films with exposure time longer than ≈100 s or composed from SWCNTs shorter than 1 μm.</span></span></span></span></span></span></p><p id="abspara0010" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="font-family: verdana;"><br /></span></span></span></span></span></span></p><p id="abspara0010" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="font-family: verdana;">for full paper see </span></span></span></span></span></span></p><p id="abspara0010" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="font-family: verdana;"><a href="https://www.sciencedirect.com/science/article/abs/pii/S0008622321012355">https://www.sciencedirect.com/science/article/abs/pii/S0008622321012355</a></span></span></span></span></span></span></p><p id="abspara0010" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><br /></span></span></span></span></span></p><p id="abspara0010" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"></span></span></span></span></span></p><p class="MsoNormal" style="line-height: 12.0pt;"><span style="color: #222222;"><span style="font-family: verdana;">… For terahertz and infrared experiments commercial <a href="http://www.teraview.com"><b>TeraView</b>
</a>time-domain spectrometer… complex (amplitude and phase) transmission coefficient measured with the <a href="http://www.teraview.com"><b>TeraView</b>
</a>time-domain …<o:p></o:p></span></span></p><br /><p></p></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-23224201834259870702022-06-21T13:59:00.000+01:002022-06-21T13:59:08.422+01:00Polymer pellet fabrication for accurate THz-TDS measurements<p><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">Murphy, Keir N., Mira Naftaly, Alison Nordon, and Daniel Markl. "Polymer pellet fabrication for accurate THz-TDS measurements." </span><i style="background-color: white; color: #222222;">Applied Sciences</i><span style="background-color: white; color: #222222;"> 12, no. 7 (2022): 3475.</span></span></p><p><span style="font-family: verdana;"><span style="background-color: white;">for full paper see </span><a href="https://www.mdpi.com/2076-3417/12/7/3475/htm">https://www.mdpi.com/2076-3417/12/7/3475/htm</a></span></p><p><span style="background-color: white;"><span style="font-family: verdana;"><b>Abstract</b></span></span></p><div class="art-abstract in-tab hypothesis_container" style="background-color: white; box-sizing: border-box; color: #222222; display: inline-block; margin: 0px; max-height: 1e+06px; padding: 0px; text-align: justify;"><span style="font-family: verdana;">We investigate fabrication of compacts using polytetrafluoroethylene (PTFE) and polyethylene (PE), and the effect of compaction conditions on their terahertz transmission properties. The conditions used to fabricate compressed powder samples for terahertz time-domain spectroscopy (THz-TDS) can impact the accuracy of the measurements and hence the interpretation of results. This study investigated the effect of compaction conditions on the accuracy of the THz-TDS analysis. Two polymers that are commonly used as matrix materials in terahertz spectroscopy studies were explored using a compaction simulator and a hydraulic press for sample preparation. THz-TDS was used to determine the refractive index and loss coefficient to compare the powder compacts (pellets) to the values of solid material. Sample porosity, axial relaxation and tensile strength were measured to assess the material’s suitability for terahertz spectroscopy. It was found that PTFE is the preferable material for creating THz-TDS samples due to its low porosity and high tensile strength. PE was found to show significant porosity at all compaction pressures, making it an unsuitable material for the accurate determination of optical parameters from THz-TDS spectroscopy measurements. The larger particle sizes of PE resulted in compacts that exhibited significantly lower tensile strength than those made from PTFE making handling and storage difficult.</span></div><p><span style="font-family: verdana;"><span style="background-color: white; color: #222222;"></span></span></p><div class="art-keywords in-tab hypothesis_container" style="background-color: white; box-sizing: border-box; color: #222222; margin: 5px 0px 0px; max-height: 1e+06px; padding: 0px;"><span style="font-family: verdana;"><em style="box-sizing: border-box; line-height: inherit; max-height: 1e+06px;">Keywords: </em><span style="box-sizing: border-box; max-height: 1e+06px;"><a href="https://www.mdpi.com/search?q=terahertz%20time%20domain%20spectroscopy" style="box-sizing: border-box; color: #4f5671; font-weight: 700; line-height: inherit; max-height: 1e+06px; text-decoration-line: none;">terahertz time domain spectroscopy</a>; <a href="https://www.mdpi.com/search?q=sample%20preparation" style="box-sizing: border-box; color: #4f5671; font-weight: 700; line-height: inherit; max-height: 1e+06px; text-decoration-line: none;">sample preparation</a>; <a href="https://www.mdpi.com/search?q=polymers" style="box-sizing: border-box; color: #4f5671; font-weight: 700; line-height: inherit; max-height: 1e+06px; text-decoration-line: none;">polymers</a>; <a href="https://www.mdpi.com/search?q=porosity" style="box-sizing: border-box; color: #4f5671; font-weight: 700; line-height: inherit; max-height: 1e+06px; text-decoration-line: none;">porosity</a></span></span></div><div class="art-keywords in-tab hypothesis_container" style="background-color: white; box-sizing: border-box; color: #222222; margin: 5px 0px 0px; max-height: 1e+06px; padding: 0px;"><span style="font-family: verdana;"><br /></span></div><div class="art-keywords in-tab hypothesis_container" style="background-color: white; box-sizing: border-box; color: #222222; margin: 5px 0px 0px; max-height: 1e+06px; padding: 0px;"><h4 class="" data-nested="3" style="box-sizing: border-box; color: black; font-weight: 400; line-height: 1.4; margin: 0px; max-height: 1e+06px; padding: 0.5em 0px; text-align: justify; text-rendering: optimizelegibility;"><span style="font-family: verdana;">"2.2.3. THz-TDS Measurements</span></h4><div class="html-p" style="box-sizing: border-box; margin-block: 1em; margin-inline: 0px; margin: 0px; max-height: 1e+06px; padding: 0px; text-align: justify; text-indent: 2em;"><span style="font-family: verdana;">THz-TDS measurements were carried out on a commercial system (TeraPulse Lx, <a href="http://www.teraview.com">Teraview</a>), with a frequency (<span class="MathJax" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>&#x3BD;</mi></semantics></math>" id="MathJax-Element-4-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline; float: none; line-height: normal; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 0px; position: relative; text-align: left; text-indent: 0px; white-space: nowrap; word-spacing: normal;" tabindex="0"><nobr aria-hidden="true" style="border: 0px; box-sizing: border-box; line-height: normal; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; padding: 0px; transition: none 0s ease 0s; vertical-align: 0px;"><span class="math" id="MathJax-Span-31" style="border: 0px; box-sizing: border-box; display: inline-block; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 0.698em;"><span style="border: 0px; box-sizing: border-box; display: inline-block; height: 0px; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: relative; transition: none 0s ease 0s; vertical-align: 0px; width: 0.571em;"><span style="border: 0px; box-sizing: border-box; clip: rect(1.518em, 1000.57em, 2.339em, -999.997em); left: 0em; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: absolute; top: -2.143em; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mrow" id="MathJax-Span-32" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;"><span class="semantics" id="MathJax-Span-33" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mi" id="MathJax-Span-34" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">ν<span style="border: 0px; box-sizing: border-box; display: inline-block; height: 1px; line-height: normal; margin: 0px; max-height: 1e+06px; overflow: hidden; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 0.066em;"></span></span></span></span><span style="border: 0px; box-sizing: border-box; display: inline-block; height: 2.15em; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 0px;"></span></span></span><span style="border-bottom-style: initial; border-color: initial; border-image: initial; border-left-style: solid; border-right-style: initial; border-top-style: initial; border-width: 0px; box-sizing: border-box; display: inline-block; height: 0.686em; line-height: normal; margin: 0px; max-height: 1e+06px; overflow: hidden; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: -0.072em; width: 0px;"></span></span></nobr><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: inline; height: 1px !important; left: 0px; line-height: normal; margin: 0px; max-height: 1e+06px; overflow: hidden !important; padding: 0px; position: static; top: 0px; transition: none 0s ease 0s; user-select: none; vertical-align: 0px; width: 1px !important;"><math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics></semantics></math></span></span>) resolution of 0.04 THz. All measurements were performed in a nitrogen-purged chamber. Sample thickness (<span class="html-italic" style="box-sizing: border-box; font-style: italic; max-height: 1e+06px;">L</span>) was measured using a micrometer (<span class="MathJax" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>&#xB1;</mo><mn>0.005</mn><mspace width="3.33333pt" /><mi>mm</mi></mrow></semantics></math>" id="MathJax-Element-5-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline; float: none; line-height: normal; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 0px; position: relative; text-align: left; text-indent: 0px; white-space: nowrap; word-spacing: normal;" tabindex="0"><nobr aria-hidden="true" style="border: 0px; box-sizing: border-box; line-height: normal; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; padding: 0px; transition: none 0s ease 0s; vertical-align: 0px;"><span class="math" id="MathJax-Span-35" style="border: 0px; box-sizing: border-box; display: inline-block; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 6.316em;"><span style="border: 0px; box-sizing: border-box; display: inline-block; height: 0px; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: relative; transition: none 0s ease 0s; vertical-align: 0px; width: 5.243em;"><span style="border: 0px; box-sizing: border-box; clip: rect(1.266em, 1005.24em, 2.339em, -999.997em); left: 0em; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: absolute; top: -2.143em; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mrow" id="MathJax-Span-36" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;"><span class="semantics" id="MathJax-Span-37" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mrow" id="MathJax-Span-38" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mo" id="MathJax-Span-39" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">±</span><span class="mn" id="MathJax-Span-40" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">0.005</span><span class="mspace" id="MathJax-Span-41" style="border: 0px; box-sizing: border-box; display: inline-block; height: 0em; line-height: normal; margin: 0px; max-height: 1e+06px; overflow: hidden; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0em; width: 0.319em;"></span><span class="mi" id="MathJax-Span-42" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px 0px 0px 0.193em; position: static; transition: none 0s ease 0s; vertical-align: 0px;">mm</span></span></span></span><span style="border: 0px; box-sizing: border-box; display: inline-block; height: 2.15em; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 0px;"></span></span></span><span style="border-bottom-style: initial; border-color: initial; border-image: initial; border-left-style: solid; border-right-style: initial; border-top-style: initial; border-width: 0px; box-sizing: border-box; display: inline-block; height: 0.989em; line-height: normal; margin: 0px; max-height: 1e+06px; overflow: hidden; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: -0.072em; width: 0px;"></span></span></nobr><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: inline; height: 1px !important; left: 0px; line-height: normal; margin: 0px; max-height: 1e+06px; overflow: hidden !important; padding: 0px; position: static; top: 0px; transition: none 0s ease 0s; user-select: none; vertical-align: 0px; width: 1px !important;"><math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics></semantics></math></span></span>) prior to the TDS measurement and was used for the calculation of the frequency-dependent refractive index <span class="MathJax" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>(</mo><mi>n</mi><mo>(</mo><mi>&#x3BD;</mi><mo>)</mo><mo>)</mo></mrow></semantics></math>" id="MathJax-Element-6-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline; float: none; line-height: normal; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 0px; position: relative; text-align: left; text-indent: 0px; white-space: nowrap; word-spacing: normal;" tabindex="0"><nobr aria-hidden="true" style="border: 0px; box-sizing: border-box; line-height: normal; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; padding: 0px; transition: none 0s ease 0s; vertical-align: 0px;"><span class="math" id="MathJax-Span-43" style="border: 0px; box-sizing: border-box; display: inline-block; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 3.286em;"><span style="border: 0px; box-sizing: border-box; display: inline-block; height: 0px; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: relative; transition: none 0s ease 0s; vertical-align: 0px; width: 2.718em;"><span style="border: 0px; box-sizing: border-box; clip: rect(1.203em, 1002.59em, 2.592em, -999.997em); left: 0em; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: absolute; top: -2.143em; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mrow" id="MathJax-Span-44" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;"><span class="semantics" id="MathJax-Span-45" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mrow" id="MathJax-Span-46" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mo" id="MathJax-Span-47" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">(</span><span class="mi" id="MathJax-Span-48" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">n</span><span class="mo" id="MathJax-Span-49" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">(</span><span class="mi" id="MathJax-Span-50" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">ν<span style="border: 0px; box-sizing: border-box; display: inline-block; height: 1px; line-height: normal; margin: 0px; max-height: 1e+06px; overflow: hidden; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 0.066em;"></span></span><span class="mo" id="MathJax-Span-51" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">)</span><span class="mo" id="MathJax-Span-52" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">)</span></span></span></span><span style="border: 0px; box-sizing: border-box; display: inline-block; height: 2.15em; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 0px;"></span></span></span><span style="border-bottom-style: initial; border-color: initial; border-image: initial; border-left-style: solid; border-right-style: initial; border-top-style: initial; border-width: 0px; box-sizing: border-box; display: inline-block; height: 1.367em; line-height: normal; margin: 0px; max-height: 1e+06px; overflow: hidden; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: -0.375em; width: 0px;"></span></span></nobr><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: inline; height: 1px !important; left: 0px; line-height: normal; margin: 0px; max-height: 1e+06px; overflow: hidden !important; padding: 0px; position: static; top: 0px; transition: none 0s ease 0s; user-select: none; vertical-align: 0px; width: 1px !important;"><math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics></semantics></math></span></span> and loss coefficient <span class="MathJax" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>(</mo><mi>&#x3B1;</mi><mo>(</mo><mi>&#x3BD;</mi><mo>)</mo><mo>)</mo></mrow></semantics></math>" id="MathJax-Element-7-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline; float: none; line-height: normal; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 0px; position: relative; text-align: left; text-indent: 0px; white-space: nowrap; word-spacing: normal;" tabindex="0"><nobr aria-hidden="true" style="border: 0px; box-sizing: border-box; line-height: normal; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; padding: 0px; transition: none 0s ease 0s; vertical-align: 0px;"><span class="math" id="MathJax-Span-53" style="border: 0px; box-sizing: border-box; display: inline-block; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 3.349em;"><span style="border: 0px; box-sizing: border-box; display: inline-block; height: 0px; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: relative; transition: none 0s ease 0s; vertical-align: 0px; width: 2.781em;"><span style="border: 0px; box-sizing: border-box; clip: rect(1.203em, 1002.65em, 2.592em, -999.997em); left: 0em; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: absolute; top: -2.143em; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mrow" id="MathJax-Span-54" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;"><span class="semantics" id="MathJax-Span-55" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mrow" id="MathJax-Span-56" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;"><span class="mo" id="MathJax-Span-57" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">(</span><span class="mi" id="MathJax-Span-58" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">α</span><span class="mo" id="MathJax-Span-59" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">(</span><span class="mi" id="MathJax-Span-60" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">ν<span style="border: 0px; box-sizing: border-box; display: inline-block; height: 1px; line-height: normal; margin: 0px; max-height: 1e+06px; overflow: hidden; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 0.066em;"></span></span><span class="mo" id="MathJax-Span-61" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">)</span><span class="mo" id="MathJax-Span-62" style="border: 0px; box-sizing: border-box; display: inline; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px;">)</span></span></span></span><span style="border: 0px; box-sizing: border-box; display: inline-block; height: 2.15em; line-height: normal; margin: 0px; max-height: 1e+06px; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: 0px; width: 0px;"></span></span></span><span style="border-bottom-style: initial; border-color: initial; border-image: initial; border-left-style: solid; border-right-style: initial; border-top-style: initial; border-width: 0px; box-sizing: border-box; display: inline-block; height: 1.367em; line-height: normal; margin: 0px; max-height: 1e+06px; overflow: hidden; padding: 0px; position: static; transition: none 0s ease 0s; vertical-align: -0.375em; width: 0px;"></span></span></nobr><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: inline; height: 1px !important; left: 0px; line-height: normal; margin: 0px; max-height: 1e+06px; overflow: hidden !important; padding: 0px; position: static; top: 0px; transition: none 0s ease 0s; user-select: none; vertical-align: 0px; width: 1px !important;"><math display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><semantics></semantics></math></span></span>."</span></div></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-59373257613729034742022-06-20T10:54:00.001+01:002022-06-20T10:54:36.895+01:00Detecting Crystallinity Using Terahertz Spectroscopy in 3D Printed Amorphous Solid Dispersions<p style="text-align: justify;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">Santitewagun, Supawan, Rishi Thakkar, J. Axel Zeitler, and Mohammed Maniruzzaman. "Detecting Crystallinity Using Terahertz Spectroscopy in 3D Printed Amorphous Solid Dispersions." </span><i style="background-color: white; color: #222222;">Molecular Pharmaceutics</i><span style="background-color: white; color: #222222;"> (2022).</span> </span></p><p style="text-align: justify;"><span style="font-family: verdana;"><br /></span></p><p style="text-align: left;"><span style="font-family: verdana;">for full paper see </span><span style="text-align: left;"><span style="font-family: verdana;"><a href="https://pubs.acs.org/doi/full/10.1021/acs.molpharmaceut.2c00163#">https://pubs.acs.org/doi/full/10.1021/acs.molpharmaceut.2c00163#</a></span></span></p><p style="text-align: justify;"><span style="font-family: verdana;"><br /></span></p><h2 class="article_abstract-title" id="Abstract" style="background-color: #f4f4f4; box-sizing: border-box; margin-bottom: 15px; margin-top: 0px; outline: none; text-align: justify;"><span style="font-family: verdana; font-size: small;">Abstract</span></h2><div class="article_abstract-content hlFld-Abstract" id="abstractBox" style="background-color: #f4f4f4; box-sizing: border-box; outline: none;"><div class="article_abstract-img" id="_i1" style="background-color: white; border: 1px solid rgb(173, 173, 173); box-sizing: border-box; float: right; height: 274px; line-height: 270px; margin: 0px 0px 20px 20px; outline: none; overflow: hidden; text-align: justify; width: 405px;"><span style="font-family: verdana;"><img alt="Abstract Image" src="https://pubs.acs.org/cms/10.1021/acs.molpharmaceut.2c00163/asset/images/medium/mp2c00163_0006.gif" style="border-style: none; box-sizing: border-box; display: inline-block; max-height: 270px; max-width: 100%; outline: none; vertical-align: middle;" /></span></div><p class="articleBody_abstractText" style="box-sizing: border-box; outline: none; text-align: justify;"><span style="font-family: verdana;">This study demonstrates the applicability of terahertz time-domain spectroscopy (THz-TDS) in evaluating the solid-state of the drug in selective laser sintering-based 3D printed dosage forms. Selective laser sintering is a powder bed-based 3D printing platform, which has recently demonstrated applicability in manufacturing amorphous solid dispersions (ASDs) through a layer-by-layer fusion process. When formulating ASDs, it is critical to confirm the final solid state of the drug as residual crystallinity can alter the performance of the formulation. Moreover, SLS 3D printing does not involve the mixing of the components during the process, which can lead to partially amorphous systems causing reproducibility and storage stability problems along with possibilities of unwanted polymorphism. In this study, a previously investigated SLS 3D printed ASD was characterized using THz-TDS and compared with traditionally used solid-state characterization techniques, including differential scanning calorimetry (DSC) and powder X-ray diffractometry (pXRD). THz-TDS provided deeper insights into the solid state of the dosage forms and their properties. Moreover, THz-TDS was able to detect residual crystallinity in granules prepared using twin-screw granulation for the 3D printing process, which was undetectable by the DSC and XRD. THz-TDS can prove to be a useful tool in gaining deeper insights into the solid-state properties and further aid in predicting the stability of amorphous solid dispersions.</span></p><p class="articleBody_abstractText" style="box-sizing: border-box; outline: none; text-align: justify;"><span style="font-family: verdana;"><br /></span></p><p class="articleBody_abstractText" style="box-sizing: border-box; outline: none; text-align: justify;"><span style="font-family: verdana;">To learn more about terahertz applications visit <a href="http://www.teraview.com" target="_blank">www.teraview.com </a></span></p></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-82165936716076200582022-05-03T15:43:00.001+01:002022-05-03T15:43:00.186+01:00Theoretical and experimental analysis of the dielectric properties of 3D orthogonal woven GFRP composites in the terahertz frequency range<div style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: left;"><div style="text-align: justify;"><span style="font-family: verdana;"> </span><span style="background-color: white; color: #222222; font-family: verdana;">Nsengiyumva, Walter, Shuncong Zhong, Longhui Zheng, Bing Wang, Xueqi Lin, Xibin Fu, and Zhike Peng. "Theoretical and experimental analysis of the dielectric properties of 3D orthogonal woven GFRP composites in the terahertz frequency range." </span><i style="background-color: white; color: #222222; font-family: verdana;">Optik</i><span style="background-color: white; color: #222222; font-family: verdana;"> 260 (2022): 169105.</span></div><div style="color: #222222; font-family: verdana; text-align: justify;"><br /></div></div><div style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: left;"><div style="text-align: left;"><span style="background-color: white; color: #222222; font-family: verdana;">for full paper see </span><span style="color: #222222; font-family: verdana;"><a href="https://www.sciencedirect.com/science/article/abs/pii/S0030402622004697">https://www.sciencedirect.com/science/article/abs/pii/S0030402622004697</a></span></div><span style="font-family: verdana;"><div style="text-align: justify;"><br /></div></span></div><div style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: justify;"><span style="font-family: verdana;"><span style="color: red;"><b>Abstract</b></span></span></div><div style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: left;"><div style="text-align: justify;"><p class="MsoNormal"><span style="color: #2e2e2e; font-family: Georgia, serif; font-size: 13.5pt; line-height: 19.26px;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEglqCaCoQntLYcB1hXMJRwfcDRh_n5xPdWob86HM9CJR6SWEX-qwgCCN9_WDw-pL7WMo502MUCCb7Lt5oLb0nMexfuvHeNQqQnvpxFm6PWa1V0cbEc012b0-tPmAYTtKSfjmp31FKgevOkYq_sAsXTrz2EVSmjYJxhZadkIGbgPhxH0Xs6G6qrF_VXV" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="244" data-original-width="181" height="240" src="https://blogger.googleusercontent.com/img/a/AVvXsEglqCaCoQntLYcB1hXMJRwfcDRh_n5xPdWob86HM9CJR6SWEX-qwgCCN9_WDw-pL7WMo502MUCCb7Lt5oLb0nMexfuvHeNQqQnvpxFm6PWa1V0cbEc012b0-tPmAYTtKSfjmp31FKgevOkYq_sAsXTrz2EVSmjYJxhZadkIGbgPhxH0Xs6G6qrF_VXV" width="178" /></a></div><br /><o:p></o:p><p></p><p class="MsoNormal"><span style="color: #2e2e2e; font-family: Verdana, sans-serif; font-size: 13.5pt; line-height: 19.26px;">A novel method to calculate the dielectric constant (</span><span class="mjxassistivemathml"><span style="box-sizing: border-box;"><span style="border: 1pt none windowtext; color: #2e2e2e; font-family: Verdana, sans-serif; padding: 0cm;"></span><span style="box-sizing: border-box; text-align: start;"><span data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><msubsup is="true"><mrow is="true"><mi is="true">&#x3B5;</mi></mrow><mrow is="true"><mi is="true">r</mi></mrow><mrow is="true"><mo is="true">&#x2032;</mo></mrow></msubsup></math>" id="MathJax-Element-2-Frame" role="presentation" style="box-sizing: border-box; display: inline-block; float: none; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; word-spacing: normal;" tabindex="0"><svg aria-hidden="true" focusable="false" height="2.341ex" role="img" style="vertical-align: -0.495ex;" viewbox="0 -794.4 885.8 1007.7" width="2.057ex" xmlns:xlink="http://www.w3.org/1999/xlink"><g fill="currentColor" stroke-width="0" stroke="currentColor" transform="matrix(1 0 0 -1 0 0)"><g is="true"><g is="true"><g is="true"><use xlink:href="#MJMATHI-3B5"></use></g></g><g is="true" transform="translate(466,314)"><g is="true"><use transform="scale(0.707)" xlink:href="#MJMAIN-2032"></use></g></g><g is="true" transform="translate(466,-150)"><g is="true"><use transform="scale(0.707)" xlink:href="#MJMATHI-72"></use></g></g></g></g></svg><span role="presentation" style="box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); overflow: hidden; transition: none 0s ease 0s; user-select: none;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msubsup is="true"><mrow is="true"><mi is="true">ε</mi></mrow><mrow is="true"><mi is="true">r</mi></mrow><mrow is="true"><mo is="true">′</mo></mrow></msubsup></math></span></span></span></span></span><span style="color: #2e2e2e; font-family: Verdana, sans-serif; font-size: 13.5pt; line-height: 19.26px;"><span style="box-sizing: border-box;"><span style="box-sizing: border-box; text-align: start;">) of three-dimensional orthogonal woven glass fiber-reinforced polymer-matrix (3DOW-GFRP) composites in the <a href="https://www.sciencedirect.com/topics/engineering/terahertz" style="box-sizing: border-box; text-decoration-color: rgb(46, 46, 46); text-decoration-line: initial; text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about terahertz from ScienceDirect's AI-generated Topic Pages"><span style="color: #2e2e2e;">terahertz</span></a> (THz) frequency range is developed and experimentally verified using the THz time-domain </span><a href="https://www.sciencedirect.com/topics/physics-and-astronomy/spectroscopy" style="box-sizing: border-box; text-decoration-color: rgb(46, 46, 46); text-decoration-line: initial; text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about spectroscopy from ScienceDirect's AI-generated Topic Pages"><span style="color: #2e2e2e;">spectroscopy</span></a><span style="box-sizing: border-box;"> (THz-TDS). The dielectric anisotropy is demonstrated through simulation by considering a single <a href="https://www.sciencedirect.com/topics/engineering/propagation-direction" style="box-sizing: border-box; text-decoration-color: rgb(46, 46, 46); text-decoration-line: initial; text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about propagation direction from ScienceDirect's AI-generated Topic Pages"><span style="color: #2e2e2e;">propagation direction</span></a> of the THz waves and three different fiber orientations in unidirectional GFRP composites. Simulation results are compared to those obtained from the classic rule-of-mixture equations to determine the representative equations for the three different cases of fiber orientations in the (</span></span></span><span class="mjxassistivemathml"><span style="box-sizing: border-box;"><span style="border: 1pt none windowtext; color: #2e2e2e; font-family: Verdana, sans-serif; padding: 0cm;"></span><span style="box-sizing: border-box; text-align: start;"><span data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow is="true"><mi is="true">x</mi><mo is="true">,</mo><mi is="true">y</mi><mo is="true">,</mo><mi is="true">z</mi></mrow></math>" id="MathJax-Element-3-Frame" role="presentation" style="box-sizing: border-box; display: inline-block; float: none; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; word-spacing: normal;" tabindex="0"><svg aria-hidden="true" focusable="false" height="1.85ex" role="img" style="vertical-align: -0.618ex;" viewbox="0 -530.3 2428.8 796.4" width="5.641ex" xmlns:xlink="http://www.w3.org/1999/xlink"><g fill="currentColor" stroke-width="0" stroke="currentColor" transform="matrix(1 0 0 -1 0 0)"><g is="true"><g is="true"><use xlink:href="#MJMATHI-78"></use></g><g is="true" transform="translate(572,0)"><use xlink:href="#MJMAIN-2C"></use></g><g is="true" transform="translate(1017,0)"><use xlink:href="#MJMATHI-79"></use></g><g is="true" transform="translate(1515,0)"><use xlink:href="#MJMAIN-2C"></use></g><g is="true" transform="translate(1960,0)"><use xlink:href="#MJMATHI-7A"></use></g></g></g></svg><span role="presentation" style="box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); overflow: hidden; transition: none 0s ease 0s; user-select: none;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow is="true"><mi is="true">x</mi><mo is="true">,</mo><mi is="true">y</mi><mo is="true">,</mo><mi is="true">z</mi></mrow></math></span></span></span></span></span><span style="color: #2e2e2e; font-family: Verdana, sans-serif; font-size: 13.5pt; line-height: 19.26px;"><span style="text-align: start;">)-coordinate system and a new model is developed to calculate </span></span><span class="mjxassistivemathml"><span style="box-sizing: border-box;"><span style="border: 1pt none windowtext; color: #2e2e2e; font-family: Verdana, sans-serif; padding: 0cm;"></span><span style="box-sizing: border-box; text-align: start;"><span data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><msubsup is="true"><mrow is="true"><mi is="true">&#x3B5;</mi></mrow><mrow is="true"><mi is="true">r</mi></mrow><mrow is="true"><mo is="true">&#x2032;</mo></mrow></msubsup></math>" id="MathJax-Element-4-Frame" role="presentation" style="box-sizing: border-box; display: inline-block; float: none; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; word-spacing: normal;" tabindex="0"><svg aria-hidden="true" focusable="false" height="2.341ex" role="img" style="vertical-align: -0.495ex;" viewbox="0 -794.4 885.8 1007.7" width="2.057ex" xmlns:xlink="http://www.w3.org/1999/xlink"><g fill="currentColor" stroke-width="0" stroke="currentColor" transform="matrix(1 0 0 -1 0 0)"><g is="true"><g is="true"><g is="true"><use xlink:href="#MJMATHI-3B5"></use></g></g><g is="true" transform="translate(466,314)"><g is="true"><use transform="scale(0.707)" xlink:href="#MJMAIN-2032"></use></g></g><g is="true" transform="translate(466,-150)"><g is="true"><use transform="scale(0.707)" xlink:href="#MJMATHI-72"></use></g></g></g></g></svg><span role="presentation" style="box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); overflow: hidden; transition: none 0s ease 0s; user-select: none;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msubsup is="true"><mrow is="true"><mi is="true">ε</mi></mrow><mrow is="true"><mi is="true">r</mi></mrow><mrow is="true"><mo is="true">′</mo></mrow></msubsup></math></span></span></span></span></span><span style="color: #2e2e2e; font-family: Verdana, sans-serif; font-size: 13.5pt; line-height: 19.26px;"><span style="box-sizing: border-box;"><span style="box-sizing: border-box; text-align: start;"> of 3DOW-GFRP composites based on electromagnetic modeling principles. As opposed to previously reported lumped circuit models, our model addresses the issue of <a href="https://www.sciencedirect.com/topics/engineering/orthogonality" style="box-sizing: border-box; text-decoration-color: rgb(46, 46, 46); text-decoration-line: initial; text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about orthogonality from ScienceDirect's AI-generated Topic Pages"><span style="color: #2e2e2e;">orthogonality</span></a> of fiber and considers the shape and spatial disposition of the composite with respect to the </span><a href="https://www.sciencedirect.com/topics/engineering/polarization-direction" style="box-sizing: border-box; text-decoration-color: rgb(46, 46, 46); text-decoration-line: initial; text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about polarization direction from ScienceDirect's AI-generated Topic Pages"><span style="color: #2e2e2e;">polarization direction</span></a> of the THz waves for accurate determination of </span></span><span class="mjxassistivemathml"><span style="box-sizing: border-box;"><span style="border: 1pt none windowtext; color: #2e2e2e; font-family: Verdana, sans-serif; padding: 0cm;"></span><span style="box-sizing: border-box; text-align: start;"><span data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><msubsup is="true"><mrow is="true"><mi is="true">&#x3B5;</mi></mrow><mrow is="true"><mi is="true">r</mi></mrow><mrow is="true"><mo is="true">&#x2032;</mo></mrow></msubsup></math>" id="MathJax-Element-5-Frame" role="presentation" style="box-sizing: border-box; display: inline-block; float: none; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; word-spacing: normal;" tabindex="0"><svg aria-hidden="true" focusable="false" height="2.341ex" role="img" style="vertical-align: -0.495ex;" viewbox="0 -794.4 885.8 1007.7" width="2.057ex" xmlns:xlink="http://www.w3.org/1999/xlink"><g fill="currentColor" stroke-width="0" stroke="currentColor" transform="matrix(1 0 0 -1 0 0)"><g is="true"><g is="true"><g is="true"><use xlink:href="#MJMATHI-3B5"></use></g></g><g is="true" transform="translate(466,314)"><g is="true"><use transform="scale(0.707)" xlink:href="#MJMAIN-2032"></use></g></g><g is="true" transform="translate(466,-150)"><g is="true"><use transform="scale(0.707)" xlink:href="#MJMATHI-72"></use></g></g></g></g></svg><span role="presentation" style="box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); overflow: hidden; transition: none 0s ease 0s; user-select: none;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msubsup is="true"><mrow is="true"><mi is="true">ε</mi></mrow><mrow is="true"><mi is="true">r</mi></mrow><mrow is="true"><mo is="true">′</mo></mrow></msubsup></math></span></span></span></span></span><span style="color: #2e2e2e; font-family: Verdana, sans-serif; font-size: 13.5pt; line-height: 19.26px;"><span style="text-align: start;">. A comparison between the measured and calculated </span></span><span class="mjxassistivemathml"><span style="box-sizing: border-box;"><span style="border: 1pt none windowtext; color: #2e2e2e; font-family: Verdana, sans-serif; padding: 0cm;"></span><span style="box-sizing: border-box; text-align: start;"><span data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><msubsup is="true"><mrow is="true"><mi is="true">&#x3B5;</mi></mrow><mrow is="true"><mi is="true">r</mi></mrow><mrow is="true"><mo is="true">&#x2032;</mo></mrow></msubsup></math>" id="MathJax-Element-6-Frame" role="presentation" style="box-sizing: border-box; display: inline-block; float: none; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; word-spacing: normal;" tabindex="0"><svg aria-hidden="true" focusable="false" height="2.341ex" role="img" style="vertical-align: -0.495ex;" viewbox="0 -794.4 885.8 1007.7" width="2.057ex" xmlns:xlink="http://www.w3.org/1999/xlink"><g fill="currentColor" stroke-width="0" stroke="currentColor" transform="matrix(1 0 0 -1 0 0)"><g is="true"><g is="true"><g is="true"><use xlink:href="#MJMATHI-3B5"></use></g></g><g is="true" transform="translate(466,314)"><g is="true"><use transform="scale(0.707)" xlink:href="#MJMAIN-2032"></use></g></g><g is="true" transform="translate(466,-150)"><g is="true"><use transform="scale(0.707)" xlink:href="#MJMATHI-72"></use></g></g></g></g></svg><span role="presentation" style="box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); overflow: hidden; transition: none 0s ease 0s; user-select: none;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msubsup is="true"><mrow is="true"><mi is="true">ε</mi></mrow><mrow is="true"><mi is="true">r</mi></mrow><mrow is="true"><mo is="true">′</mo></mrow></msubsup></math></span></span></span></span></span><span style="color: #2e2e2e; font-family: Verdana, sans-serif; font-size: 13.5pt; line-height: 19.26px;"><span style="text-align: start;"> indicates that the proposed method is highly accurate with ≤</span><span style="font-family: Arial, sans-serif; font-size: 13.5pt; line-height: 19.26px;"> </span><span style="font-size: 13.5pt; line-height: 19.26px;">2.68% maximum error, while the latter reaches 7.82% for the classic rule-of-mixture equations. This method is potentially useful for the design of 3DOW-GFRP with desired </span></span><span class="mjxassistivemathml"><span style="box-sizing: border-box;"><span style="border: 1pt none windowtext; color: #2e2e2e; font-family: Verdana, sans-serif; padding: 0cm;"></span><span style="box-sizing: border-box; text-align: start;"><span data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><msubsup is="true"><mrow is="true"><mi is="true">&#x3B5;</mi></mrow><mrow is="true"><mi is="true">r</mi></mrow><mrow is="true"><mo is="true">&#x2032;</mo></mrow></msubsup></math>" id="MathJax-Element-7-Frame" role="presentation" style="box-sizing: border-box; display: inline-block; float: none; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; word-spacing: normal;" tabindex="0"><svg aria-hidden="true" focusable="false" height="2.341ex" role="img" style="vertical-align: -0.495ex;" viewbox="0 -794.4 885.8 1007.7" width="2.057ex" xmlns:xlink="http://www.w3.org/1999/xlink"><g fill="currentColor" stroke-width="0" stroke="currentColor" transform="matrix(1 0 0 -1 0 0)"><g is="true"><g is="true"><g is="true"><use xlink:href="#MJMATHI-3B5"></use></g></g><g is="true" transform="translate(466,314)"><g is="true"><use transform="scale(0.707)" xlink:href="#MJMAIN-2032"></use></g></g><g is="true" transform="translate(466,-150)"><g is="true"><use transform="scale(0.707)" xlink:href="#MJMATHI-72"></use></g></g></g></g></svg><span role="presentation" style="box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); overflow: hidden; transition: none 0s ease 0s; user-select: none;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msubsup is="true"><mrow is="true"><mi is="true">ε</mi></mrow><mrow is="true"><mi is="true">r</mi></mrow><mrow is="true"><mo is="true">′</mo></mrow></msubsup></math></span></span></span></span></span><span style="color: #2e2e2e; font-family: Verdana, sans-serif; font-size: 13.5pt; line-height: 19.26px;"><span style="box-sizing: border-box; text-align: start;"> for applications such as <a href="https://www.sciencedirect.com/topics/engineering/electromagnetic-shielding" style="box-sizing: border-box; text-decoration-color: rgb(46, 46, 46); text-decoration-line: initial; text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about electromagnetic shielding from ScienceDirect's AI-generated Topic Pages"><span style="color: #2e2e2e;">electromagnetic shielding</span></a> and electrostatic discharging structures.</span></span><span style="font-family: Verdana, sans-serif;"><o:p></o:p></span></p></div></div><div style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: left;"><div style="text-align: justify;"><span style="font-family: verdana;"><br /></span></div><span style="font-family: verdana;"><div style="text-align: justify;"><span style="color: #222222;">"… (</span><a href="http://www.teraview.com" target="_blank"><b>TeraView</b> </a><span style="color: #222222;">TPS 4000) is employed to measure the
dielectric properties of 3DOW-GFRP </span><span style="color: #222222;">composite samples. Fig. 2 presents the photograph of the experimental setup and </span><span style="color: #222222;">the schematic diagram of the operation of the </span><b style="color: #222222;"><a href="http://www.teraview.com" target="_blank">TeraView</a></b><span style="color: #222222;"><a href="http://www.teraview.com" target="_blank"> </a>… frequency of 50
Hz …"</span></div></span></div><div style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: left;"><div style="text-align: justify;"><span style="color: #222222; font-family: verdana;"><br /></span></div><span style="font-family: verdana;"><div style="text-align: justify;">for more information about <a href="http://www.teraview.com">TeraView's </a>products visit <a href="http://www.teraview.com">www.teraview.com</a></div></span></div><div id="abs0010" style="box-sizing: border-box; color: #2e2e2e; font-family: NexusSerif, Georgia, "Times New Roman", Times, STIXGeneral, "Cambria Math", "Lucida Sans Unicode", "Microsoft Sans Serif", "Segoe UI Symbol", "Arial Unicode MS", serif; font-size: 18px; margin: 0px; padding: 0px;"><p id="sp0085" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"></span></p></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-34515935247667413022022-04-28T14:09:00.001+01:002022-04-28T14:09:00.191+01:00Novel Cu0.96V0.02M0.02O (M = Mn, Fe, Co, Ni) nanocompositions: Remarkable optical and room temperature superparamagnetic properties<div style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: left;"><div style="text-align: justify;"><span style="background-color: white; color: #222222; font-family: verdana;">Wahba, Mohammed Ahmed, Talaat A. Hameed, Walid Sharmoukh, and Saad Mabrouk Yakout. "Novel Cu0. 96V0. 02M0. 02O (M= Mn, Fe, Co, Ni) nanocompositions: Remarkable optical and room temperature superparamagnetic properties." </span><i style="background-color: white; color: #222222; font-family: verdana;">Optical Materials</i><span style="background-color: white; color: #222222; font-family: verdana;"> 127 (2022): 112254.</span></div><div style="text-align: justify;"><span style="background-color: white; color: #222222; font-family: verdana;"><br /></span></div><span style="font-family: verdana;"><div style="text-align: left;"><span style="background-color: white; color: #222222;">for full paper see</span></div><div style="text-align: left;"><span style="color: #222222;"><a href="https://www.sciencedirect.com/science/article/abs/pii/S0925346722002889">https://www.sciencedirect.com/science/article/abs/pii/S0925346722002889</a></span></div><div style="text-align: justify;"><br /></div></span></div><div style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: left;"><div style="text-align: justify;"><b style="font-family: verdana;">Abstract</b></div><span style="font-family: verdana;"><div style="text-align: justify;"><br /></div></span></div><div style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: justify;"><span style="font-family: verdana;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;">Multifunctional CuO semiconductor is a promising material for the full development of electronic, <a class="topic-link" href="https://www.sciencedirect.com/topics/physics-and-astronomy/spintronics" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about spintronics from ScienceDirect's AI-generated Topic Pages">spintronics</a>, terahertz and biomedical devices. In this study, new CuO compositions with strong room temperature superparamagnetic, terahertz optical </span><a class="topic-link" href="https://www.sciencedirect.com/topics/materials-science/conductivity" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about conductivity from ScienceDirect's AI-generated Topic Pages">conductivity</a> and terahertz dielectric constant properties were realized. Pure CuO, Cu</span><span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.96</span>V<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.02</span>Mn<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.02</span>O, Cu<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.96</span>V<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.02</span>Fe<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.02</span>O, Cu<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.96</span>V<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.02</span>Co<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.02</span>O and Cu<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.96</span>V<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.02</span>Ni<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.02</span><span style="box-sizing: border-box; margin: 0px; padding: 0px;">O <a class="topic-link" href="https://www.sciencedirect.com/topics/materials-science/nanopowders" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about nanopowders from ScienceDirect's AI-generated Topic Pages">nanopowders</a> were synthesized by sol-gel method. The XRD confirmed the synthesis of single phase of monoclinic CuO structure. Based on the reduction on unit cell volume, the incorporation of V</span><span style="box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; top: -0.5em; vertical-align: baseline;">3+/4+</span>, Mn<span style="box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; top: -0.5em; vertical-align: baseline;">2+</span>, Fe<span style="box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; top: -0.5em; vertical-align: baseline;">3+</span>, Co<span style="box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; top: -0.5em; vertical-align: baseline;">2+</span> and Ni<span style="box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; top: -0.5em; vertical-align: baseline;">2+</span><span style="box-sizing: border-box; margin: 0px; padding: 0px;"> ions into CuO lattice have been verified. The <a class="topic-link" href="https://www.sciencedirect.com/topics/materials-science/doping-additives" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about dopants from ScienceDirect's AI-generated Topic Pages">dopants</a><span style="box-sizing: border-box; margin: 0px; padding: 0px;"> lead to formation of fine spherical nanoparticles with homogenous distribution and similar size. The <a class="topic-link" href="https://www.sciencedirect.com/topics/physics-and-astronomy/transmission-electron-microscopy" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about TEM from ScienceDirect's AI-generated Topic Pages">TEM</a> image of Cu</span></span><span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.96</span>V<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.02</span>Fe<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.02</span>O reveals the formation of uniform spherical-nanoparticles possesses define surface edges with average size of 29 nm. The FTIR vibrational absorption modes of the synthesized CuO nanocompositions ruled out the presence of impurities or the existence of Cu<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">2</span><span style="box-sizing: border-box; margin: 0px; padding: 0px;">O phase. Optically, both (V, Mn) and (V, Co) codoping induced a red shift in the band gap energy of CuO (1.39 eV) on contrast to (V, Fe) and (V, Ni) with obvious blue shift. CuO codoped with different transition elements has been studied by terahertz time-domain <a class="topic-link" href="https://www.sciencedirect.com/topics/physics-and-astronomy/spectroscopy" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about spectroscopy from ScienceDirect's AI-generated Topic Pages">spectroscopy</a> (THz-TDS) in the range from 0.3 to 3 THz. The higher atomic weight elements show higher values of dielectric constant and optical conductivity. Cu</span><span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.96</span>V<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.02</span>Fe<span style="bottom: -0.25em; box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; vertical-align: baseline;">0.02</span><span style="box-sizing: border-box; margin: 0px; padding: 0px;">O exhibited an excellent intrinsic superparamagnetic curve with semi-saturation magnetization of ∼0.39 emu/g, <a class="topic-link" href="https://www.sciencedirect.com/topics/physics-and-astronomy/coercivity" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about coercivity from ScienceDirect's AI-generated Topic Pages">coercivity</a> and retentivity values close to zero.</span></span></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-91623235556378549442022-04-25T14:02:00.001+01:002022-04-25T14:02:00.210+01:00Terahertz Testing Technique for Fiber-Reinforced Composite Materials<div style="line-height: 12.75pt; text-align: left;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">Zhong, Shuncong, and Walter Nsengiyumva. "Terahertz Testing Technique for Fiber-Reinforced Composite Materials." In </span><i style="background-color: white; color: #222222;">Nondestructive Testing and Evaluation of Fiber-Reinforced Composite Structures</i><span style="background-color: white; color: #222222;">, pp. 273-314. Springer, Singapore, 2022.</span></span></div><div style="line-height: 12.75pt; text-align: left;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;"><br /></span><span style="background-color: white; color: #222222;">for full paper see </span><span style="color: #222222;"><a href="https://link.springer.com/chapter/10.1007/978-981-19-0848-4_6">https://link.springer.com/chapter/10.1007/978-981-19-0848-4_6</a></span><span style="background-color: white; color: #222222;"><br /></span><span style="font-size: small;"><br /></span></span></div><div style="line-height: 12.75pt; text-align: left;"><b><span style="font-family: verdana;"><span style="font-size: small;">Abstrac</span></span><span style="font-family: verdana;">t</span></b></div><div style="line-height: 12.75pt; text-align: left;"><b><span style="font-family: verdana;"><br /></span></b></div><div style="line-height: 12.75pt; text-align: left;"><span style="font-family: verdana;">Terahertz (THz) systems constitute an effective tool for the NDT&E community for the testing and characterization of fiber-reinforced composite materials. However, their systems are still very complicated and expensive to commercialize. Also, establishing the inspection limits for the vast majority of fiber-reinforced composite structures is still not achieved because this technique is relatively new in the area of material testing and evaluation. Nevertheless, this technique presents several advantages including the fact that it can see “through” the defects in thin composites and examine the underlying fabric of the material, overcoming the shadowing effect that is commonly observed with other NDT techniques such as ultrasonic testing and most of the radiographic testing techniques. Although the technology had been deferred for many years because of the inadequacy of its emission and detection devices, the so-called “THz gap”, this problem has recently been addressed thanks to the development of highly performing semiconductors and ultrafast electronics. To date, extremely short pulses required for the energy frequency of the THz waves can be achieved, suggesting that spatial resolution of the inspection levels higher than those of the normal microwave-based NDT techniques can be reached using THz systems. A lot has been done but much still needs to be done, particularly because there are no reported studies on the inspection of moisture uptake in fiber-reinforced composite structures nor are there any studies that confidently inspect conductive materials using THz waves. Indeed, this would be a highly valued milestone to the literature if it was achieved. In applications involving the inspection of thick composites and sandwich structures, THz systems do not, unfortunately, provide reliable inspection results owing to the attenuation and/or the scattering effects of the THz waves in thick sections.</span></div><div style="line-height: 12.75pt; text-align: left;"><span style="font-family: verdana;"><br /></span></div><div style="line-height: 12.75pt; text-align: left;"><span style="font-family: verdana;"><br /><span style="color: #222222;">… Although tremendous progress has been made in the THz
technology in recentyears, typically the signal-to-noise ratio (SNR) is somewhat smaller except
whenusing some of the most advanced THz systems such as <b>T<a href="http://www.teraview.com">eraview</a></b><a href="http://www.teraview.com"> (<b>TeraView</b>
TPS </a>…</span></span></div><div class="c-article-section__content" id="Abs1-content" style="background-color: #fcfcfc; box-sizing: inherit; color: #333333; margin: 0px 0px 40px; padding: 8px 0px 0px; text-align: left;"><p style="box-sizing: inherit; line-height: 1.8; margin: 0px; overflow-wrap: break-word; padding: 0px; word-break: break-word;"><span style="font-family: verdana;"><br /></span></p><p style="box-sizing: inherit; line-height: 1.8; margin: 0px; overflow-wrap: break-word; padding: 0px; word-break: break-word;"><span style="font-family: verdana;"><br /></span></p></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-74349938216476149452022-04-22T13:59:00.001+01:002022-04-22T14:06:46.485+01:00Multifunctional Elastic Nanocomposites with Extremely Low Concentrations of Single-Walled Carbon Nanotubes<p style="text-align: justify;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">Novikov, Ilya V., Dmitry V. Krasnikov, Anton M. Vorobei, Yaroslav I. Zuev, Hassaan A. Butt, Fedor S. Fedorov, Sergey A. Gusev et al. "Multifunctional Elastic Nanocomposites with Extremely Low Concentrations of Single-Walled Carbon Nanotubes." </span><i style="background-color: white; color: #222222;">ACS Applied Materials & Interfaces</i><span style="background-color: white; color: #222222;"> (2022).</span></span></p><p style="text-align: justify;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;"><br /></span></span></p><p style="text-align: justify;"><span style="color: #222222; font-family: verdana;"><span style="background-color: white;">for full paper see </span></span><span style="text-align: left;"><span style="color: #222222; font-family: verdana;"><a href="https://pubs.acs.org/doi/abs/10.1021/acsami.2c01086">https://pubs.acs.org/doi/abs/10.1021/acsami.2c01086</a></span></span></p><p style="text-align: justify;"><span style="text-align: left;"><br /></span></p><h2 class="article_abstract-title" id="Abstract" style="background-color: #f4f4f4; box-sizing: border-box; margin-bottom: 15px; margin-top: 0px; outline: none; text-align: justify;"><span style="font-family: verdana; font-size: small;">Abstract</span></h2><div class="article_abstract-content hlFld-Abstract" id="abstractBox" style="background-color: #f4f4f4; box-sizing: border-box; outline: none;"><figure class="article__inlineFigure article_abstract-img" data-index="0" id="_i1" style="background-color: white; border: 1px solid rgb(173, 173, 173); box-sizing: border-box; float: right; height: 274px; line-height: 270px; margin: 0px 0px 20px 20px; outline: none; overflow: hidden; text-align: justify; width: 405px;"><span style="font-family: verdana;"><img alt="" class="inline-fig internalNav" id="_i2" src="https://pubs.acs.org/cms/10.1021/acsami.2c01086/asset/images/medium/am2c01086_0008.gif" style="border-style: none; box-sizing: border-box; cursor: pointer; display: inline-block; max-height: 270px; max-width: 100%; outline: none; vertical-align: middle;" /></span></figure><p class="articleBody_abstractText" style="box-sizing: border-box; outline: none; text-align: justify;"><span style="font-family: verdana;">Stretchable and flexible electronics has attracted broad attention over the last years. Nanocomposites based on elastomers and carbon nanotubes are a promising material for soft electronic applications. Despite the fact that single-walled carbon nanotube (SWCNT) based nanocomposites often demonstrate superior properties, the vast majority of the studies were devoted to those based on multiwalled carbon nanotubes (MWCNTs) mainly because of their higher availability and easier processing procedures. Moreover, high weight concentrations of MWCNTs are often required for high performance of the nanocomposites in electronic applications. Inspired by the recent drop in the SWCNT price, we have focused on fabrication of elastic nanocomposites with very low concentrations of SWCNTs to reduce the cost of nanocomposites further. In this work, we use a fast method of coagulation (antisolvent) precipitation to fabricate elastic composites based on thermoplastic polyurethane (TPU) and SWCNTs with a homogeneous distribution of SWCNTs in bulk TPU. Applicability of the approach is confirmed by extra low percolation threshold of 0.006 wt % and, as a consequence, by the state-of-the-art performance of fabricated elastic nanocomposites at very low SWCNT concentrations for strain sensing (gauge factor of 82 at 0.05 wt %) and EMI shielding (efficiency of 30 dB mm<span style="box-sizing: border-box; line-height: 0; outline: none; position: relative; top: -0.5em; vertical-align: baseline;">–1</span> at 0.01 wt %).</span></p><p class="articleBody_abstractText" style="box-sizing: border-box; outline: none; text-align: justify;"><span style="font-family: verdana;"><br /></span></p><p class="articleBody_abstractText" style="box-sizing: border-box; outline: none; text-align: justify;"><span style="background-color: white;"><span style="font-family: verdana;">EMI-shielding efficiency of the nanocomposites in the THz range was tested using a <a href="http://www.teraview.com" target="_blank">time-domain spectrometer (TeraView TPS 3000)</a>. Both disk shaped samples with a thickness of 0.5 mm (the same were used for impedance tests) and thin film samples were used for testing, ranging in thickness from 0.1–0.2 mm, depending on the SWCNT loading in the nanocomposites.</span></span></p><p class="articleBody_abstractText" style="box-sizing: border-box; font-family: Georgia, serif; font-size: 17px; outline: none;"><br /></p><p class="articleBody_abstractText" style="box-sizing: border-box; font-family: Georgia, serif; font-size: 17px; outline: none;"><br /></p></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-66484090891886936542022-03-24T08:24:00.001+00:002022-03-24T08:24:26.704+00:00Spatially inhomogeneous operation of phase-change memory<p style="text-align: justify;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">Kim, Dasol, Soobin Hwang, Taek Sun Jung, Min Ahn, Jaehun Jeong, Hanbum Park, Juhwan Park, Jae Hoon Kim, Byung Joon Choi, and Mann-Ho Cho. "Spatially inhomogeneous operation of phase-change memory." </span><i style="background-color: white; color: #222222;">Applied Surface Science</i><span style="background-color: white; color: #222222;"> (2022): 153026.</span></span></p><p><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">for full paper see </span></span><span style="color: #222222; font-family: verdana;"><a href="https://www.sciencedirect.com/science/article/abs/pii/S0169433222005931">https://www.sciencedirect.com/science/article/abs/pii/S0169433222005931</a></span></p><p></p><p class="MsoNormal" style="line-height: normal; margin-bottom: 6.0pt; margin-left: 0cm; margin-right: 0cm; margin-top: 24.0pt; mso-outline-level: 2; text-align: justify;"><b><span style="color: #4472c4; font-family: "Verdana",sans-serif; font-size: 12.0pt; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-GB; mso-themecolor: accent1;">Abstract<o:p></o:p></span></b></p>
<p class="MsoNormal" style="line-height: normal; margin-bottom: 12.0pt; text-align: justify;"><table cellpadding="0" cellspacing="0" class="tr-caption-container" style="float: left;"><tbody><tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEgsraZ9CFSMyyQdx0nO6zikrXL88yEEezQrK89UJDuM3xq09ieV72b4_U6g-onk6y-es-nhN75x9rER4oU-Ts7LPXv-v9lY4ca871EbPS4W1HjjG1bYbnbJq63jmWncnhihO1uBzEb9yR0ecTMh2fl8hyLlFLEJFFwni-8rMrGzIDFX6wc-xUr3ivxm" style="clear: left; margin-bottom: 1em; margin-left: auto; margin-right: auto;"><img alt="" data-original-height="244" data-original-width="261" height="299" src="https://blogger.googleusercontent.com/img/a/AVvXsEgsraZ9CFSMyyQdx0nO6zikrXL88yEEezQrK89UJDuM3xq09ieV72b4_U6g-onk6y-es-nhN75x9rER4oU-Ts7LPXv-v9lY4ca871EbPS4W1HjjG1bYbnbJq63jmWncnhihO1uBzEb9yR0ecTMh2fl8hyLlFLEJFFwni-8rMrGzIDFX6wc-xUr3ivxm=w320-h299" width="320" /></a></td></tr><tr><td class="tr-caption" style="text-align: center;"></td></tr></tbody></table><span style="color: #2e2e2e; font-family: "Verdana",sans-serif; font-size: 12.0pt; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-GB;">Rapid changes in the electrical
resistance depending on the phases (amorphous and crystal) are one of the most
promising bases for universal memory. Phase-change region is spatially
inhomogeneous during memory operation in a unit cell because Joule heat for the
phase-change is generated at the interface between the metal and compounds.
However, delicate optimization of the electrical and thermal properties at the
interface is underexplored compared to the bulk. In this study, we modulate the
electrical and thermal conductivities by incorporating oxygen in Ag-In-Sb-Te,
superior memory compounds where oxygen is chosen for high accessibility and
efficiency for the modulation of conductivity. We further analyze the oxidation
and crystallization process at the atomic level. Based on the results, we
successfully improve the memory performances such as speed, energy, signal
ratio, and reliability simultaneously by inserting the oxygenated layer as an
interfacial layer. Our study proves that there is considerable room to optimize
memory performance at the interface</span><span style="color: #2e2e2e; font-family: "Georgia",serif; font-size: 13.5pt; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-GB;">.<o:p></o:p></span></p><p class="MsoNormal" style="line-height: normal; margin-bottom: 12pt; text-align: justify;"><span style="text-align: left;"><span style="color: #4472c4; font-family: Verdana, sans-serif;"><b>Experimental</b></span></span><b><span style="color: #4472c4; font-family: Verdana, sans-serif; font-size: 12pt;"> </span></b></p><p class="MsoNormal" style="line-height: normal; margin-bottom: 12.0pt; text-align: justify;"><span style="color: #222222;"><span style="font-family: verdana;">… The optical
conductivities of AIST with various thicknesses were obtained from THz-TDS using a <a href="http://www.teraview.com"><b>Teraview</b> </a><a href="https://teraview.com/terapulselx/" target="_blank">TPS3000 </a>under a N 2 purged state. The
time-domain signal after sample transmission has the information of the sample
conductivity.....</span></span></p><p class="MsoNormal" style="line-height: normal; margin-bottom: 12.0pt; text-align: justify;"><span style="color: #2e2e2e; font-family: "Georgia",serif; font-size: 13.5pt; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-GB;"><br /></span></p><p class="MsoNormal" style="line-height: normal; margin-bottom: 12.0pt; text-align: justify;"><span style="color: #2e2e2e; font-family: "Georgia",serif; font-size: 13.5pt; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-GB;"><br /><br /></span></p><br /><p></p><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-77234195346573781862022-03-22T14:23:00.000+00:002022-03-22T14:23:12.503+00:00Terahertz Dielectric Characterization of Low-Loss Thermoplastics for 6G Applications<div style="box-sizing: inherit; line-height: 1.8; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify; word-break: break-word;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">Zhai, Min, Alexandre Locquet, and D. S. Citrin. "Terahertz Dielectric Characterization of Low-Loss Thermoplastics for 6G Applications." </span><i style="background-color: white; color: #222222;">International Journal of Wireless Information Networks</i><span style="background-color: white; color: #222222;"> (2022): 1-6.</span></span></div><div style="box-sizing: inherit; line-height: 1.8; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify; word-break: break-word;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;"><br /></span></span></div><div style="box-sizing: inherit; line-height: 1.8; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify; word-break: break-word;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">for full paper see </span></span><span style="text-align: left;"><span style="color: #222222; font-family: verdana;"><a href="https://link.springer.com/article/10.1007/s10776-022-00554-x">https://link.springer.com/article/10.1007/s10776-022-00554-x</a></span></span></div><div style="box-sizing: inherit; line-height: 1.8; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: left; word-break: break-word;"><div style="text-align: justify;"><b style="font-family: Verdana, sans-serif;"><br /></b></div><div style="text-align: justify;"><b style="font-family: Verdana, sans-serif;">Abstract</b></div><span style="font-family: verdana;"><div style="text-align: justify;">
<p class="MsoNormal" style="text-align: justify;"><span style="font-family: "Verdana",sans-serif;">Common
thermoplastics, namely, polycarbonate (PC), poly (methyl methacrylate) (PMMA),
and acrylonitrile butadiene styrene (ABS) are low-cost materials with potential
applications in emerging <a href="https://teraview.com/6g/">6G communications systems</a>, ranging from
microelectronics packaging to metasurfaces for reflectors and filters. In addition,
low-loss materials are also needed for more pedestrian applications, such as
packaging for entire handheld devices, subassemblies, and high-frequency
windows where low-cost is key and long lifetime might not be a requirement. In
this work, we utilize terahertz time-domain spectroscopy from 500 GHz to 2 THz
to characterize the dielectric properties and loss tangent for each
thermoplastic above. The plastics investigated have refractive index (</span><span style="font-family: "Cambria Math",serif; mso-bidi-font-family: "Cambria Math";">∼</span><span style="font-family: "Verdana",sans-serif;"> 1.6</span><span style="font-family: "Verdana",sans-serif; mso-bidi-font-family: Calibri;">–</span><span style="font-family: "Verdana",sans-serif;">1.7) in the <a href="https://teraview.com/6g/">6G</a> band with low
dispersion. The absorption, however, increases at high frequencies as is common
in disordered materials, highlighting a key challenge for <a href="https://teraview.com/6g/">6G</a>. Nonetheless, in
absolute terms, all the thermoplastics studied present low-loss performance
compared with (higher–index) common glasses and ceramics within the entire
frequency range, suggesting that they are promising candidates for selected
applications for <a href="https://teraview.com/6g/">future 6G systems</a>.<o:p></o:p></span></p><p class="MsoNormal" style="text-align: justify;"><br /></p><p class="MsoNormal" style="line-height: 12.75pt;"><span style="color: #222222;">… The transmission measurements in this work were performed
using a commercial pulsed broadband THz time-domain spectroscopy (TDS) system (TPS Spectra 3000 from <a href="http://www.teraview.com"><b>TeraView</b> </a>Ltd, UK). Compared to vector network analyzers (VNA),
another …<span style="font-family: Arial, sans-serif; font-size: 10pt;"><o:p></o:p></span></span></p><br /></div></span></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-6799771536584859952022-03-08T09:20:00.000+00:002022-03-08T09:20:59.878+00:00Terahertz-infrared spectroscopy of wafer-scale films of single-walled carbon nanotubes treated by plasma<div style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px; text-align: left;"><div style="text-align: justify;"><span style="font-family: verdana;"> </span><span style="background-color: white; color: #222222; font-family: verdana;">Zhukov, S. S., E. S. Zhukova, A. V. Melentev, B. P. Gorshunov, A. P. Tsapenko, D. S. Kopylova, and Albert G. Nasibulin. "Terahertz-infrared spectroscopy of wafer-scale films of single-walled carbon nanotubes treated by plasma." </span><i style="background-color: white; color: #222222; font-family: verdana;">Carbon</i><span style="background-color: white; color: #222222; font-family: verdana;"> 189 (2022): 413-421.</span></div><div style="text-align: justify;"><span style="background-color: white; color: #222222; font-family: verdana;"><br /></span></div><div style="text-align: justify;"><span style="background-color: white; color: #222222; font-family: verdana;">for full paper see </span></div><div style="text-align: justify;"><span style="text-align: left;"><span style="color: #222222; font-family: verdana;"><a href="https://www.sciencedirect.com/science/article/abs/pii/S0008622321012355">https://www.sciencedirect.com/science/article/abs/pii/S0008622321012355</a></span></span></div><div style="text-align: justify;"><span style="background-color: white; color: #222222; font-family: verdana;"><br /></span></div><span style="font-family: verdana;"><div style="text-align: justify;"><b>Abstract</b></div><div style="text-align: justify;"><br /></div><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><div style="text-align: justify;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;">We investigated terahertz-infrared electrodynamic properties of wafer-scale films composed of plasma-treated single-walled carbon <a class="topic-link" href="https://www.sciencedirect.com/topics/engineering/nanotubes" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about nanotubes from ScienceDirect's AI-generated Topic Pages">nanotubes</a> (SWCNTs) and films comprising SWCNTs grown with different lengths. The spectra of complex conductance of the films were measured at frequencies 5–20 000 cm</span><span style="box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; top: -0.5em; vertical-align: baseline;">−1</span><span style="box-sizing: border-box; margin: 0px; padding: 0px;"> and in the temperature interval 5–300 K. Terahertz <a class="topic-link" href="https://www.sciencedirect.com/topics/engineering/spectral-sensitivity" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about spectral response from ScienceDirect's AI-generated Topic Pages">spectral response</a><span style="box-sizing: border-box; margin: 0px; padding: 0px;"> of films of pristine SWCNTs is well described with the Drude <a class="topic-link" href="https://www.sciencedirect.com/topics/materials-science/conductivity" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about conductivity from ScienceDirect's AI-generated Topic Pages">conductivity</a> model and a plasmon resonance located at ≈100 cm</span></span><span style="box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; top: -0.5em; vertical-align: baseline;">−1</span>. Stepwise treatment of the films with oxygen plasma led to a gradual suppression of the Drude spectral weight from the low-frequency side. For films with the nanotubes shorter than 1 μm, <em style="box-sizing: border-box; margin: 0px; padding: 0px;">i</em>.<em style="box-sizing: border-box; margin: 0px; padding: 0px;">e</em><span style="box-sizing: border-box; margin: 0px; padding: 0px;">., close to electrons <a class="topic-link" href="https://www.sciencedirect.com/topics/engineering/mean-free-path" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about mean free path from ScienceDirect's AI-generated Topic Pages">mean free path</a><span style="box-sizing: border-box; margin: 0px; padding: 0px;"> and <a class="topic-link" href="https://www.sciencedirect.com/topics/engineering/localisation" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about localization from ScienceDirect's AI-generated Topic Pages">localization</a><span style="box-sizing: border-box; margin: 0px; padding: 0px;"> length, scattering of charge carriers at the nanotubes edges is shown to additionally contribute to the carriers scattering rate and to the damping of plasmon resonance. The <a class="topic-link" href="https://www.sciencedirect.com/topics/engineering/temperature-coefficient" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about temperature coefficient from ScienceDirect's AI-generated Topic Pages">temperature coefficient</a><span style="box-sizing: border-box; margin: 0px; padding: 0px;"> of <a class="topic-link" href="https://www.sciencedirect.com/topics/engineering/ac-resistance" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about ac resistance from ScienceDirect's AI-generated Topic Pages">ac resistance</a><span style="box-sizing: border-box; margin: 0px; padding: 0px;"> (ac TCR) in both kinds of films is found to strongly increase in amplitude during cooling and frequency decrease. The values of ac TCR increase in films with longer time of <a class="topic-link" href="https://www.sciencedirect.com/topics/engineering/plasma-treatment" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-decoration-color: rgb(46, 46, 46); text-decoration-thickness: 1px; text-underline-offset: 1px; word-break: break-word;" title="Learn more about plasma treatment from ScienceDirect's AI-generated Topic Pages">plasma treatment</a> and nanotubes with shorter length but reach saturation in films with exposure time longer than ≈100 s or composed from SWCNTs shorter than 1 μm.</span></span></span></span></span></div><div style="text-align: justify;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><br /></span></span></span></span></span></div><div style="text-align: justify;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><br /></span></span></span></span></span></div></span><span style="box-sizing: border-box; margin: 0px; padding: 0px;"><div style="text-align: justify;"><span style="color: #222222;">.....complex (amplitude and </span><span style="color: #222222;">phase) transmission coefficient measured with the </span><a href="http://www.teraview.com" target="_blank"><b>TeraView</b>
</a><span style="color: #222222;">time-domain...... </span></div></span></span></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-78872797599445750762022-03-04T08:47:00.001+00:002022-03-04T08:47:23.430+00:00Revealing inscriptions obscured by time on an early-modern lead funerary cross using terahertz multispectral imaging<div style="text-align: left;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">Dong, Junliang, Ana Ribeiro, Aurélien Vacheret, Alexandre Locquet, and D. S. Citrin. "Revealing inscriptions obscured by time on an early-modern lead funerary cross using terahertz multispectral imaging." </span><i style="background-color: white; color: #222222;">Scientific Reports</i><span style="background-color: white; color: #222222;"> 12, no. 1 (2022): 1-10.</span></span></div><div style="text-align: left;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;"><br /></span></span></div><div style="text-align: left;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">for full paper see </span></span><span style="color: #222222; font-family: verdana;"><a href="https://www.nature.com/articles/s41598-022-06982-2">https://www.nature.com/articles/s41598-022-06982-2</a></span></div><div style="text-align: left;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;"><br /></span></span></div><div style="text-align: left;"><span style="font-family: verdana;"><span style="background-color: white;"><br /><div style="text-align: justify;"><b><span style="text-align: left;"><span style="color: #222222;">Abstract</span></span><span style="background-color: transparent; color: #222222;"> </span></b></div><div style="text-align: justify;"><b><span style="background-color: transparent; color: #222222;"><br /></span></b></div><div style="color: #222222; text-align: justify;"><span style="background-color: transparent;">The presence of a corrosion layer on lead art and archæological objects can severely impede the
interpretation of inscriptions, thus hampering our overall understanding of the object and its context.
While the oxidation of lead that dominates corrosion may be chemically reversible via reduction,
potentially providing some access to inscriptions otherwise obscured by time, corrosion damage is
overall neither entirely reversible nor is the reduction process in all cases easy or feasible to carry
out. In this study, by taking advantage of the unique penetration ability of terahertz radiation and
the abundant frequency bands covered by a single-cycle terahertz pulse, we perform non-destructive
terahertz multispectral imaging to look under the corrosion on a sixteenth century lead funerary cross
(croix d’absolution) from Remiremont in Lorraine, France. The multispectral images obtained from
various terahertz frequency bands are fed into a judiciously designed post-processing chain for image
restoration and enhancement, thus allowing us for the first time to read obscured inscriptions that
might have otherwise been lost. Our approach, which brings together in a new way the THz properties
of the constituent materials and advanced signal- and image-processing techniques, opens up new
perspectives for multi-resolution analysis at terahertz frequencies as a technique in archæometry
and will ultimately provide unprecedented information for digital acquisition and documentation,
character extraction, classification, and recognition in archæological studies.</span></div></span><span style="background-color: white; color: #222222;"><br /></span><b>"Methods </b></span></div><div style="text-align: left;"><span style="font-family: verdana;"><b><br /></b></span></div><div style="text-align: left;"><span style="font-family: verdana;"><b>THz imaging system</b> </span></div><div style="text-align: left;"><span style="font-family: verdana;"><br /></span></div><div style="text-align: justify;"><span style="font-family: verdana;">A typical THz time-domain system (<a href="http://www.teraview.com" target="_blank">TeraView TPS Spectra 3000</a>) operating in a
refection geometry was employed in this study. The incident angle of the THz beam was ∼10 degrees. The GaAs
photoconductive antenna was excited by an ultrafast laser to produce roughly single-cycle THz pulses with
bandwidth extending from 60 GHz to 3 THz. The maximum peak of its power spectrum was located at about 0.3
THz. Each recorded temporal reflected THz waveform contains 4096 data points, and the data sampling period
was set to 0.011634 ps. The signal was averaged over 10 shots per pixel to enhance signal to noise. The scanning
of the sample was conducted in a temperature-controlled laboratory at 22 ◦C. The humidity in the laboratory
was held about 38%."</span></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-89202490274392705412022-03-01T10:08:00.001+00:002022-03-01T10:08:14.672+00:00Magnetic terahertz resonances above the Néel temperature in the frustrated kagome antiferromagnet averievite<div style="line-height: 12.75pt; text-align: justify;"><span style="font-family: verdana;"><span style="background-color: white; color: #222222;">Biesner, Tobias, Seulki Roh, Andrej Pustogow, Hong Zheng, J. F. Mitchell, and Martin Dressel. "Magnetic terahertz resonances above the Néel temperature in the frustrated kagome antiferromagnet averievite." </span><i style="background-color: white; color: #222222;">Physical Review B</i><span style="background-color: white; color: #222222;"> 105, no. 6 (2022): L060410.</span></span></div><div style="line-height: 12.75pt; text-align: left;"><div style="text-align: right;"><span style="color: #222222; font-family: verdana;"><br /></span></div><span style="font-family: verdana;"><div style="text-align: left;"><span style="background-color: white; color: #222222;">for full paper see </span><span style="color: #222222;"><a href="https://journals.aps.org/prb/abstract/10.1103/PhysRevB.105.L060410">https://journals.aps.org/prb/abstract/10.1103/PhysRevB.105.L060410</a></span></div></span></div><div style="line-height: 12.75pt; text-align: left;"><div style="text-align: justify;"><span style="color: #222222; font-family: verdana;"><br /></span></div><span style="font-family: verdana;"><div style="text-align: justify;"><b>Abstract</b></div></span></div><div style="line-height: 12.75pt; text-align: left;"><div style="text-align: justify;"><span style="background: white; color: #222222; font-family: verdana; line-height: 107%;"><br /></span></div><div style="text-align: justify;"><span style="background: white; color: #222222; font-family: verdana; line-height: 107%;">Time-domain magneto-THz spectroscopy is utilized to study the frustrated
magnet averievite </span><span class="mjx-char" style="font-family: verdana;"><span id="MJXc-Node-1" style="border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span style="background: white; border: 1pt none windowtext; color: #222222; padding: 0cm;"><span id="MJXc-Node-2" style="box-sizing: content-box !important; display: inline-block;"><span id="MathJax-Element-1-Frame" style="box-sizing: border-box; display: inline-block; float: none; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal;" tabindex="0"><span id="MJXc-Node-3" style="box-sizing: content-box !important; display: inline-block;"><span id="MJXc-Node-4" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important; display: inline-block;"><span id="MJXc-Node-5" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">Cu</span></span></span></span></span><span class="mjx-char"><span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border: 1pt none windowtext; line-height: 107%; padding: 0cm;"><span style="box-sizing: content-box !important; display: inline-block; vertical-align: -.212em;"><span id="MJXc-Node-6" style="box-sizing: content-box !important; display: inline-block;"><span id="MJXc-Node-7" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">5</span></span><span id="MJXc-Node-8" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">−</span></span><span id="MJXc-Node-9" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">x</span></span></span></span></span><span class="mjx-char"><span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border: 1pt none windowtext; padding: 0cm;"></span></span><span id="MJXc-Node-10" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important; display: inline-block;"><span id="MJXc-Node-11" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">Zn</span></span></span></span></span><span class="mjx-char"><span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border: 1pt none windowtext; line-height: 107%; padding: 0cm;"><span style="box-sizing: content-box !important; display: inline-block; vertical-align: -.212em;"><span id="MJXc-Node-12" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">x</span></span></span></span></span><span class="mjx-char"><span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border: 1pt none windowtext; padding: 0cm;"></span><span id="MJXc-Node-13" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important; display: inline-block;"><span id="MJXc-Node-14" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">V</span></span></span></span></span><span class="mjx-char"><span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border: 1pt none windowtext; line-height: 107%; padding: 0cm;"><span style="box-sizing: content-box !important; display: inline-block; vertical-align: -.212em;"><span id="MJXc-Node-15" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">2</span></span></span></span></span><span class="mjx-char"><span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border: 1pt none windowtext; padding: 0cm;"></span><span id="MJXc-Node-16" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important; display: inline-block;"><span id="MJXc-Node-17" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">O</span></span></span></span></span><span class="mjx-char"><span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border: 1pt none windowtext; line-height: 107%; padding: 0cm;"><span style="box-sizing: content-box !important; display: inline-block; vertical-align: -.212em;"><span id="MJXc-Node-18" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">10</span></span></span></span></span><span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; line-height: 107%;"></span></span></span></span></span><span style="text-align: start;">(CsCl). Pronounced THz resonances are observed in
unsubstituted samples (</span></span><span class="mjx-char" style="font-family: verdana;"><span id="MJXc-Node-19" style="border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span style="background: white; border: 1pt none windowtext; color: #222222; padding: 0cm;"><span id="MJXc-Node-20" style="box-sizing: content-box !important; display: inline-block;"><span id="MathJax-Element-2-Frame" style="box-sizing: border-box; display: inline-block; float: none; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal;" tabindex="0"><span id="MJXc-Node-21" style="box-sizing: content-box !important; display: inline-block;"><span id="MJXc-Node-22" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">x</span></span><span id="MJXc-Node-23" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">=</span></span><span id="MJXc-Node-24" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">0</span></span></span></span></span><span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; line-height: 107%;"></span></span></span><span style="text-align: start;">) when cooling below the onset of short-range
magnetic correlations. The influence of external magnetic effects confirms the
magnetic origin of these resonances. Increasing Zn substitution suppresses the
resonances, as frustration effects dominate, reflecting the nonmagnetic phases
for </span></span><span class="mjx-char" style="font-family: verdana;"><span id="MJXc-Node-25" style="border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span style="background: white; border: 1pt none windowtext; color: #222222; padding: 0cm;"><span id="MJXc-Node-26" style="box-sizing: content-box !important; display: inline-block;"><span id="MathJax-Element-3-Frame" style="box-sizing: border-box; display: inline-block; float: none; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal;" tabindex="0"><span id="MJXc-Node-27" style="box-sizing: content-box !important; display: inline-block;"><span id="MJXc-Node-28" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">x</span></span><span id="MJXc-Node-29" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">></span></span><span id="MJXc-Node-30" style="box-sizing: content-box !important; display: inline-block;"><span style="box-sizing: content-box !important;">0.25</span></span></span></span></span><span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; line-height: 107%;"></span></span></span><span style="text-align: start;"> compounds. The temperature evolution of the
THz spectra is complemented with electron spin resonance spectroscopy. This
comparison allows a direct probe of the different contributions from magnetic
order, frustration, and structural properties in the phase diagram of
averievite. Our results illustrate the effect of magnetic interactions in THz
spectra of frustrated magnets</span><span style="background: white; color: #222222; line-height: 107%;">.</span></span></div><span style="font-family: verdana;"><div style="text-align: left;"><p class="MsoNormal" style="text-align: justify;"><o:p></o:p></p></div></span></div><div style="line-height: 12.75pt; text-align: left;"><div style="text-align: left;"><span style="font-family: verdana;"><br /></span></div><span style="font-family: verdana;"><div style="text-align: left;">… All specimens were measured with a time-domain THz
spectrometer (<b><a href="http://www.teraview.com" target="_blank">TeraView </a></b>TeraPulse 4000) attaching a homemade He-bath cryostat and a superconducting magnet (<a href="https://www.oxinst.com/" target="_blank">Oxford Instruments</a>). The magneto-THz experiments were performed
in …</div></span></div><h4 class="title" style="box-sizing: border-box; color: #adaba5; cursor: pointer; font-family: "Proxima Nova", "Helvetica Neue", Helvetica, Helvetica, Arial, sans-serif; font-size: 1.64286rem; font-weight: 400; line-height: 1.1; margin: 0px 0px 0.5em; padding: 0px; text-align: left; text-rendering: optimizelegibility; text-transform: uppercase;"><span class="right" style="box-sizing: border-box; float: right; font-size: 12px; position: relative; top: 6px;"><i class="fi-minus" style="box-sizing: border-box; display: block; line-height: inherit;"></i></span></h4><div class="content" data-loaded="yes" style="box-sizing: border-box; color: #222222; font-family: "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif; font-size: 14px; margin: 0px; padding: 0px;"><p style="box-sizing: border-box; font-family: inherit; font-size: 1rem; line-height: 1.6; margin: 0px 0px 1.42857rem; padding: 0px; text-align: justify; text-rendering: optimizelegibility;"><br /></p><div class="clear-wrap" style="box-sizing: border-box; clear: both; margin: 0px; overflow: visible; padding: 0px;"><ul class="small-block-grid-2 large-block-grid-7" style="box-sizing: border-box; font-family: inherit; font-size: 1rem; line-height: 1.6; list-style-position: inside; margin: 0px -0.71429rem; padding: 0px;"><li style="box-sizing: border-box; clear: both; display: block; float: left; height: auto; list-style: none; margin: 0px; padding: 0px 0.71429rem 1.42857rem; width: 94.275px;"><a class="active" data-orbit-link="figure-0" data-reveal-id="slideshow" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #3294d8; cursor: pointer; line-height: inherit;"><img alt="Figure " src="https://journals.aps.org/prb/article/10.1103/PhysRevB.105.L060410/figures/1/thumbnail" style="border: 1px solid rgb(237, 233, 230); box-sizing: border-box; display: inline-block; height: auto; max-width: 100%; padding: 1px; vertical-align: middle;" /></a></li><li style="box-sizing: border-box; clear: none; display: block; float: left; height: auto; list-style: none; margin: 0px; padding: 0px 0.71429rem 1.42857rem; width: 94.275px;"><a class="active" data-orbit-link="figure-1" data-reveal-id="slideshow" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #3294d8; cursor: pointer; line-height: inherit;"><img alt="Figure " src="https://journals.aps.org/prb/article/10.1103/PhysRevB.105.L060410/figures/2/thumbnail" style="border: 1px solid rgb(237, 233, 230); box-sizing: border-box; display: inline-block; height: auto; max-width: 100%; padding: 1px; vertical-align: middle;" /></a></li><li style="box-sizing: border-box; clear: none; display: block; float: left; height: auto; list-style: none; margin: 0px; padding: 0px 0.71429rem 1.42857rem; width: 94.275px;"><a class="active" data-orbit-link="figure-2" data-reveal-id="slideshow" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #3294d8; cursor: pointer; line-height: inherit;"><img alt="Figure " src="https://journals.aps.org/prb/article/10.1103/PhysRevB.105.L060410/figures/3/thumbnail" style="border: 1px solid rgb(237, 233, 230); box-sizing: border-box; display: inline-block; height: auto; max-width: 100%; padding: 1px; vertical-align: middle;" /></a></li><li style="box-sizing: border-box; clear: none; display: block; float: left; height: auto; list-style: none; margin: 0px; padding: 0px 0.71429rem 1.42857rem; width: 94.275px;"><a class="active" data-orbit-link="figure-3" data-reveal-id="slideshow" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #3294d8; cursor: pointer; line-height: inherit;"><img alt="Figure " src="https://journals.aps.org/prb/article/10.1103/PhysRevB.105.L060410/figures/4/thumbnail" style="border: 1px solid rgb(237, 233, 230); box-sizing: border-box; display: inline-block; height: auto; max-width: 100%; padding: 1px; vertical-align: middle;" /></a></li><li style="box-sizing: border-box; clear: none; display: block; float: left; height: auto; list-style: none; margin: 0px; padding: 0px 0.71429rem 1.42857rem; width: 94.275px;"><a class="active" data-orbit-link="figure-4" data-reveal-id="slideshow" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #3294d8; cursor: pointer; line-height: inherit;"><img alt="Figure " src="https://journals.aps.org/prb/article/10.1103/PhysRevB.105.L060410/figures/5/thumbnail" style="border: 1px solid rgb(237, 233, 230); box-sizing: border-box; display: inline-block; height: auto; max-width: 100%; padding: 1px; vertical-align: middle;" /></a></li></ul></div></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-15866810259059279332022-02-28T08:00:00.001+00:002022-02-28T08:00:00.171+00:00Component spectra extraction and quantitative analysis for preservative mixtures by combining terahertz spectroscopy and machine learning<div style="line-height: 12pt; text-align: left;"><div style="text-align: justify;"><span style="font-family: verdana;"> </span><span style="background-color: white; color: #222222; font-family: verdana;">Yan, Hui, Wenhui Fan, Xu Chen, Hanqi Wang, Chong Qin, and Xiaoqiang Jiang. "Component spectra extraction and quantitative analysis for preservative mixtures by combining Terahertz spectroscopy and machine learning." </span><i style="background-color: white; color: #222222; font-family: verdana;">Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy</i><span style="background-color: white; color: #222222; font-family: verdana;"> (2022): 120908.</span></div><div style="text-align: justify;"><span style="background-color: white; color: #222222; font-family: verdana;"><br /></span></div><div style="text-align: left;"><span style="background-color: white; color: #222222; font-family: verdana;">for full paper see </span></div><div style="text-align: left;"><span style="text-align: left;"><span style="color: #222222; font-family: verdana;"><a href="https://www.sciencedirect.com/science/article/abs/pii/S1386142522000567">https://www.sciencedirect.com/science/article/abs/pii/S1386142522000567</a></span></span></div><span style="font-family: verdana;"><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><b>Abstract</b></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEiliqZR7oj6T1-C5T1ZqMQ74pKAA6G-SUqszJkMSJwZQPVRu9C4h8GTgdvsTn6GvyNbld9ZvQUPv7OfYlpnRAnj4HgPIr0DXdm2qv1R8UcBI1N84mvixMfoYpla2E1aSwPO0WO2mN_f5Uq83BlY8hf_urK9Q9AjFl-qNjiPo_UcnzmDVWMD9wkqGtAO" style="margin-left: 1em; margin-right: 1em;"><img alt="" data-original-height="200" data-original-width="403" height="159" src="https://blogger.googleusercontent.com/img/a/AVvXsEiliqZR7oj6T1-C5T1ZqMQ74pKAA6G-SUqszJkMSJwZQPVRu9C4h8GTgdvsTn6GvyNbld9ZvQUPv7OfYlpnRAnj4HgPIr0DXdm2qv1R8UcBI1N84mvixMfoYpla2E1aSwPO0WO2mN_f5Uq83BlY8hf_urK9Q9AjFl-qNjiPo_UcnzmDVWMD9wkqGtAO" width="320" /></a></div><br />Preservatives are universally used in synergistic combination to enhance antimicrobial effect. Identify compositions and quantify components of preservatives are crucial steps in quality monitoring to guarantee merchandise safety. In the work, three most common preservatives, sorbic acid, potassium sorbate and sodium benzoate, are deliberately mixed in pairs with different mass ratios, which are supposed to be the “unknown” multicomponent systems and measured by terahertz (THz) time-domain spectroscopy. Subsequently, three major challenges have been accomplished by machine learning methods in this work. The singular value decomposition (SVD) effectively obtains the number of components in mixed preservatives. Then, the component spectra are successfully extracted by non-negative matrix factorization (NMF) and self-modeling mixture analysis (SMMA), which match well with the measured THz spectra of pure reagents. Moreover, the support vector machine for regression (SVR) designed an underlying model to the target components and simultaneously identify contents of each individual component in validation mixtures with decision coefficient R<span style="box-sizing: border-box; line-height: 0; margin: 0px; padding: 0px; position: relative; top: -0.5em; vertical-align: baseline;">2</span> = 0.989. By taking advantages of the fingerprint-based THz technique and machine learning methods, our approach has been demonstrated the great potential to be served as a useful strategy for detecting preservative mixtures in practical applications.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><br /></div><span style="color: #222222;"><div style="text-align: justify;">… THz spectra of samples were obtained by <a href="https://teraview.com/terapulselx/" target="_blank">TPS system</a> (<a href="http://www.teraview.com" target="_blank"><b>Teraview</b>
</a>Ltd., UK) with resolution of 1 cm -1 (0.03 THz). Measurements were operated under purged
dry-air (relative humidity < 1%) to minimize the impact of ambient water vapor. All
the …</div></span></span></div><div id="as015" style="box-sizing: border-box; color: #2e2e2e; margin: 0px; padding: 0px; text-align: left;"><p id="sp0015" style="box-sizing: border-box; margin: 0px 0px 16px; padding: 0px;"><br /></p></div><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0tag:blogger.com,1999:blog-4040067478506307905.post-90580012044230660012022-02-24T08:33:00.001+00:002022-02-24T08:33:11.409+00:00The 9th International Conference on Optical Terahertz Science and Technology (OTST 2022) <p>The 9th International Conference on Optical Terahertz
Science and Technology (OTST 2022) will be held in the heart of Central Europe,
in Budapest, the capital city of Hungary between 19–24 June 2022 (Sunday to
Friday).</p>
<p class="MsoNormal">The conference webpage is available at: <span lang="HU" style="mso-ansi-language: HU;"><a href="https://www.otst2022.hu/"><span lang="EN-GB" style="mso-ansi-language: EN-GB;">https://www.otst2022.hu/</span></a></span></p>
<p class="MsoNormal">The abstract submission is open at: <span lang="HU" style="mso-ansi-language: HU;"><a href="https://www.otst2022.hu/registration-and-submission/abstract-submission.html"><span lang="EN-GB" style="mso-ansi-language: EN-GB;">https://www.otst2022.hu/registration-and-submission/abstract-submission.html</span></a></span></p>
<p class="MsoNormal"><b>The deadline for the abstract submission is 14 March
2022.</b></p>
<p class="MsoNormal">The conference will be organized as an on-site event and
personal attendance is strongly encouraged. However, the possibility of online
participation will also be given. They hope that OTST 2022 will give our
scientific community a new impulse and the possibility to meet each other in
person after a long time.<o:p></o:p></p><div class="blogger-post-footer">From TeraView</div>TeraViewhttp://www.blogger.com/profile/14186746310029441359noreply@blogger.com0