Ratep, A., A. AbdelAziem, M. Y. Hanfi, K. A. Mahmoud, and I. Kashif, Enhancing gamma-ray shielding with bismuth oxide-infused boron oxides, , vol. 56, issue 2, pp. 143, 2023. AbstractWebsite

The objective of this study is to explore how the replacement of barium oxide (BaO) by bismuth oxide (Bi2O3) affects the optical, structural and gamma rays shield ability of borate glasses. To accomplish this, a series of borate-based glasses was fabricated according the chemical formula 60B2O3 + (40-x) BaO + xBi2O3, where 0 < x < 10 wt.%. X-ray diffraction confirmed that an amorphous phase was present at all fabricated glasses. Thermal analysis indicated that Bi2O3 could serve as a glass modifier for all values of x greater than zero. Furthermore, the optical absorption profile showed that the samples had a greater absorption rate as x increased within the 1–4 eV photon energy range, with only minor fluctuations beyond 4 eV. Monte Carlo simulation demonstrated that increasing the concentration of Bi2O3 led to an increased radiation-absorbing capacity, where the linear attenuation coefficient of the fabricated glasses enhanced by 26% from 74.48 to 94.17 cm−1 at gamma ray energy of 0.015 MeV. Simultaneously, the half value thickness for the fabricated glasses reduced from 3.99 to 3.73 cm, raising the Bi2O3 concentration between 0 and 10 wt.%, respectively. These results indicate that adding Bi2O3 to boron oxides can significantly improve shielding the ability of the material to against gamma rays, alter the glass samples, and potentially be cost-effective. This study could lead to faster synthesis processes for glass modifiers, with important implications for designing and producing materials to shield against harmful gamma rays in industrial and medical applications.

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Abdelaziem, A., A. M. Mohamed, Y. M. Yousry, R. Borayek, A. S. Razeen, N. Zhang, S. Chen, L. Zhang, K. Lin, and Z. Liu, "Effect of poling on the dielectric properties of synthesized β-poly (vinylidene fluoride) foam", Journal of Applied PhysicsJournal of Applied Physics, vol. 133, issue 12: American Institute of Physics, pp. 124101, 2023. AbstractWebsite
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Ke, L., L. Zhang, N. Zhang, Q. Y. S. Wu, H. S. Leong, A. Abdelaziem, J. S. Mehta, and Y. - C. Liu, Corneal elastic property investigated by terahertz technology, , vol. 12, issue 1, pp. 19229, 2022. AbstractWebsite

Terahertz (THz) spectroscopy technique has been applied in ex vivo biomechanical properties analysis of human corneas. Upon the application of light pressure on the cornea, the photo elastic birefringent effect, anisotropic deformation, thickness changes and hydration levels will contribute to the sudden phase changes of terahertz time domain signal. The shelf lifetime study shows that the phase shift is reduced and cornea loose the biomechanical properties with the increase of hydration level. Mechanical behaviors have been further studied based on the “fresh” cut corneas with the similar hydration levels. THz signal was collected by focusing inside of the cornea to avoid the phase shift due to light stress caused movement of the corneal surface. By this way, the amount of THz signal refractive index variation is correlated to the elastic property of the corneas. The correlation between the THz signal phase shift and refractive index shift due to the corneal strain can be used to derive the elastic Young’s modulus. Our results demonstrated the THz spectroscopy, as a non-contact and non-invasive detection method, could be potential for understanding the mechanism of corneal deformation under the action of intraocular pressure in the physiological environment in future.

Sayyed, M. I., M. Y. Hanfi, K. A. Mahmoud, and A. Abdelaziem, Theoretical Investigation of the radiation-protection properties of the CBS glass family, , vol. 258, pp. 168851, 2022. AbstractWebsite

A novel scalable approach combining Monte Carlo Simulation (MS) and the Phy-X/PDS (Phy-X) software program have been developed to investigate the radiation shielding properties of the well-known (CBS-1, 2, and 3) family of glass-ceramics (CaO, B2O3, and SiO2). The linear attenuation coefficient (LAC), half-value layer (HVL), mean free path (MFP) and transmission factor (TF) were identified as important parameters controlling the behavior of the CBS shielding family by MS. Phy-X, on the other hand, explored the effective (Zeff) and equivalent (Zeq) atomic numbers, as well as the build-up factors. It was discovered that (CBS-1) and (CBS-3) shielding could be comparable to commercially manufactured glass shielding, and even higher in some cases. Furthermore, CBS-3 demonstrated the greatest shielding ability among the CBS family members, with a maximum LAC value of ~ 38.77 cm-1 at a gamma energy of ~ 0.015 MeV. Our findings pave the way for future research based on the CBS glass family to accelerate the development of shielding materials for high-energy electromagnetic waves.

Nair, G. K. R., A. Abdelaziem, X. Zhao, X. Wang, D. Hu, Y. Wu, C. Xun, F. Le Goualher, C. Zhu, P. L. P. Yin, et al., "Chemical Vapor Deposition of Phase-Pure 2D 1T-CrS2", physica status solidi (RRL) – Rapid Research Lettersphysica status solidi (RRL) – Rapid Research Letters, vol. 16, issue 4: John Wiley & Sons, Ltd, pp. 2100495, 2022. AbstractWebsite

2D transition-metal dichalcogenides of chromium are technologically important due to their diverse electrical and magnetic properties. Herein this study, 1T-CrS2 nanosheets as thin as 2?nm are successfully synthesized by an atmospheric pressure space-confined chemical vapor deposition method. The prepared CrS2 nanosheets are stable at room temperature. Electrical measurement shows a quasi n-type semiconductor behavior. In addition, terahertz characterizations on 1T-CrS2 reveal its potential to integrate with the ultrathin infrared sensor platforms.

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