Water dynamics in bulk and dispersed in silica CaCl2 hydrates studied by neutron scattering methods |
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| Authors: | Daniil I. Kolokolov, Alexander G. Stepanov, Ivan S. Glaznev, Yurii I. Aristov, Marie Plazanet,Herv Jobic |
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| Affiliation: | aInstitut de Recherches sur la Catalyse et l’Environnement de LYON, Université Lyon 1, CNRS, UMR 5256, 2 avenue Albert Einstein, F-69626 Villeurbanne, France;bBoreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090, Russia;cInstitut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble, France |
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| Abstract: | Quasi-elastic and inelastic neutron scattering techniques have been used to study the dynamics of water in CaCl2 · nH2O (n = 1/3,2,4,6,9) hydrates dispersed in silica, in comparison with the bulk hydrates. Inelastic scattering shows that the water molecules in dispersed hydrates are in an amorphous state. Quasi-elastic scattering indicates a higher mobility of water in the hydrates dispersed in silica, compared to bulk hydrates. The self-diffusivity of water in the dispersed hydrates increases with water concentration, while remaining below the one of pure water. The neutron and pulsed-field gradient NMR diffusivities are similar, which indicates that the hydrates form a thin and continuous layer on the pore walls of silica. |
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| Keywords: | Water Silica Neutron scattering |
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