Effect of Gas Adsorption on Acoustic Wave Propagation in MFI Zeolite Membrane Materials: Experiment and Molecular Simulation
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- 作者：Etoungh D. Manga ; Hugues Blasco ; Philippe Da-Costa ; Martin Drobek ; Andr茅 Ayral ; Emmanuel Le Clezio ; Gilles Despaux ; Benoit Coasne ; Anne Julbe
- 刊名：Langmuir
- 出版年：2014
- 出版时间：September 2, 2014
- 年：2014
- 卷：30
- 期：34
- 页码：10336-10343
- 全文大小：414K
- ISSN：1520-5827
文摘
The present study reports on the development of a characterization method of porous membrane materials which consists of considering their acoustic properties upon gas adsorption. Using acoustic microscopy experiments and atomistic molecular simulations for helium adsorbed in a silicalite-1 zeolite membrane layer, we showed that acoustic wave propagation could be used, in principle, for controlling the membranes operando. Molecular simulations, which were found to fit experimental data, showed that the compressional modulus of the composite system consisting of silicalite-1 with adsorbed He increases linearly with the He adsorbed amount while its shear modulus remains constant in a large range of applied pressures. These results suggest that the longitudinal and Rayleigh wave velocities (VL and VR) depend on the He adsorbed amount whereas the transverse wave velocity VT remains constant.