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Estimation of pore sizes using laser absorption in molecular oxygen gas enclosed in mesoporous alumina
Author(s): Ahmed Al-Saudi; Watheq Al-Basheer; Abdulaziz Aljalal; Khaled Gasmi; Samer Qari Sr.
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Paper Abstract

Collisions of gas molecules with the walls of small pores in nanoporous materials can cause the width of gas absorption lines to become wider. Also, the effective absorption path lengths through the gas become longer due to multi-scattering within the nanoporous materials. GAs in Scattering Media Absorption Spectroscopy (GASMAS) is an effective technique that can differentiate between the absorption from the gas within pores and the absorption from the bulk of scattering materials. A Vertical-Cavity Surface-Emitting Laser (VCSEL) emitting around 760 nm is used to investigate the absorption from molecular oxygen gas trapped within mesoporous alumina Al2O3. The pore size of the alumina samples are also characterized based on Barrett, Joyner and Halenda (BJH) method. In this work, we will present the correlation between the pore sizes of the mesoporous alumina samples the width of the absorption line of molecular oxygen gas under different experimental conditions.

Paper Details

Date Published: 11 April 2019
PDF: 7 pages
Proc. SPIE 11028, Optical Sensors 2019, 1102818 (11 April 2019); doi: 10.1117/12.2519604
Show Author Affiliations
Ahmed Al-Saudi, King Fahd Univ. of Petroleum & Minerals (Saudi Arabia)
Watheq Al-Basheer, King Fahd Univ. of Petroleum & Minerals (Saudi Arabia)
Abdulaziz Aljalal, King Fahd Univ. of Petroleum & Minerals (Saudi Arabia)
Khaled Gasmi, King Fahd Univ. of Petroleum & Minerals (Saudi Arabia)
Samer Qari Sr., King Fahd Univ. of Petroleum & Minerals (Saudi Arabia)


Published in SPIE Proceedings Vol. 11028:
Optical Sensors 2019
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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