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Abstract
1H NMR relaxation measurements in a broad range of frequencies give information on the dynamical behaviour of water molecules in dilute suspensions of swelling clay (Hectorite). The logarithmic frequency variation of the longitudinal relaxation rate suggests a 2D diffusion of the water molecules adsorbed on the clay particles, with a residence time as long as 10 −6 s. The corresponding high activation free energy (40 kJ/mol) originates mainly from the clay-water interactions, as shown by Monte Carlo simulations of clay hydration.
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