Direct measurement of the translational mobility of deuterium hydride molecules confined in a model microporous material: AlPO4-5 zeolite
CRMC -CNRS, Campus de Luminy - Case 901, 13288
Marseille Cedex 9, France
2 Institut Laue-Langevin - 38042 Grenoble Cedex, France
Accepted: 18 October 1996
We have measured by incoherent quasi-elastic neutron scattering the diffusion coefficient Dt of sorbed hydrogen (HD) molecules in the one-dimensional micropore network of zeolite. The confined hydrogen phase in such nano-scale cylindrical tubes (diameter ) behaves as a quasi-(1d) fluid phase. At temperature , in the medium loading regime ), the translational molecular mobility is quite large, . When increasing , Dt strongly decreases down to (). At lower temperature , the HD molecular mobility is still important, at .
PACS: 47.55.Mh – Flows through porous media / 05.30.-d – Quantum statistical mechanics / 66.10.-x – Diffusion and ionic conduction in liquids
© EDP Sciences, 1996