title: Effect of gas adsorption on acoustic wave propagation in MFI zeolite membrane materials: experiment and molecular simulation.
abstract: 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.
authors.affiliation: Institut Européen des Membranes, UMR 5635-CNRS-ENSCM-UM2, University Montpellier 2 , Place Eugène Bataillon, 34095 Montpellier, Cedex 5, France.
authors.forename: Etoungh D
authors.initials: ED
authors.lastname: Manga
authors.forename: Hugues
authors.initials: H
authors.lastname: Blasco
authors.forename: Philippe
authors.initials: P
authors.lastname: Da-Costa
authors.forename: Martin
authors.initials: M
authors.lastname: Drobek
authors.forename: André
authors.initials: A
authors.lastname: Ayral
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Le Clezio
authors.forename: Gilles
authors.initials: G
authors.lastname: Despaux
authors.forename: Benoit
authors.initials: B
authors.lastname: Coasne
authors.forename: Anne
authors.initials: A
authors.lastname: Julbe