J. Phys. IV France
Volume 10, Numéro PR7, May 2000
International Workshop on Dynamics in Confinement
Page(s) Pr7-125 - Pr7-130
International Workshop on Dynamics in Confinement

J. Phys. IV France 10 (2000) Pr7-125-Pr7-130

DOI: 10.1051/jp4:2000725

Dynamics of molecules in confinement and technical relevance

H. Jobic

Institut de Recherches sur la Catalyse, CNRS, 2 avenue Albert Einstein, 69626 Villeurbanne, France

Quasi-elastic neutron scattering allows to characterise molecular diffusion of species adsorbed in porous materials. Diffusion coefficients can be derived, without a model, over space scales where the molecular motion follows Fick's law. Furthermore, using jump diffusion models, one can determine characteristic times and distances for the elementary jumps. These experimental results are of value to understand separation processes and shape-selectivity in catalysis, and also to test molecular simulations performed on these systems. Applications of the QENS technique reviewed here concern mainly molecules adsorbed in zeolites, some results obtained in microporous silica are also presented.

© EDP Sciences 2000