Abstract
Dynamics of water contained in the pores of alumina gel as studied using acombination of the high and medium resolution quasi-elastic neutron scattering(QENS) technique at room temperature and extending to the supercooled regionis reported. In the single particle picture of the dynamics of water moleculesin confined geometry (Volino-Dianoux model), two types of water are found tobe present in the pores of alumina gel. Some water molecules are attached tothe surfaces (localized) and others undergo diffusion within the otherwiseavailable space in the pores. The localization radius and diffusion constant(Dloc) characterizing the local dynamics and also the diffusion constant(Dt) and residence time (τ0) of the water molecules diffusing insidethe alumina gel pores are obtained at different temperatures. Water moleculesare found to undergo restricted diffusion in the pores at higher temperatures,which approach the bulk-like behaviour in the supercooled region.
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