Structure-terahertz property relationship in tellurite glasses

 Tostanoski, Nicholas J., and S. K. Sundaram. "Structure-terahertz property

 relationship in tellurite glasses." Applied Physics A 128, no. 11 (2022): 1-13.

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, n(THz), at 0.502 THz. NWT and LWT glasses record higher measurable n(THz) correlated to a glass network with substantial TeO2 and WO3 content with mixed Te–O–W linkages and TeO2- or WO3-rich content with homonuclear Te–O–Te or W–O–W linkages, respectively. Concurrent examination revealed three distinct regions of n(THz).

for full paper see https://link.springer.com/article/10.1007/s00339-022-06148-x

New TeraSolve system from TeraView for the analysis of the porosity of Solid dosage forms

There is a clear need for a robust process #analytical technology tool that can be used for #online/ inline prediction of dissolution and disintegration characteristics of pharmaceutical tablets during manufacture.

https://www.sciencedirect.com/science/article/abs/pii/S0022354920307796

Water ingress into tablets is known to be highly influenced by the microstructure of the tablet, particularly tablet #porosity.

see https://www.sciencedirect.com/science/article/abs/pii/S0378517320306293

#Porosity, 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 #bioavailability of an orally administered drug.

see https://link.springer.com/article/10.1007/s10762-019-00659-0

For more information contact us at https://teraview.com/get-in-touch/

Soft Defect Localization and Characterization for Advanced IC Packaging Using Novel EOTPR In-Situ Dynamic Temperature Probing

 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 ISTFA 2022, pp. 289-293. ASM International, 2022.

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 Electro-Optical Terahertz Pulsed Reflectometry (EOTPR) 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.

for full paper see 

https://dl.asminternational.org/istfa/proceedings/ISTFA2022/289/23926

Special Role of Mg2+ in the Formation of the Hydration Shell of Adenosine Triphosphate

Penkov, N. V., N. A. Penkova, and V. I. Lobyshev. "Special Role of Mg2+ in the Formation of the Hydration Shell of Adenosine Triphosphate." Physics of Wave Phenomena 30, no. 5 (2022): 344-350.

Abstract

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 Mg2+ or Ca2+ 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 Mg2+ 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.

for full paper see https://link.springer.com/article/10.3103/S1541308X22050090 

… The spectra in the THz range were recorded on a TPS Spectra3000 (Teraview, 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 …

Time of flight improved thermally grown oxide thickness measurement with terahertz spectroscopy

 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 terahertz spectroscopy." Frontiers of Mechanical Engineering 17, no. 4 (2022): 1-11.

for full paper see https://link.springer.com/article/10.1007/s11465-022-0705-3

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.