1H NMR study of the structure and dynamics of water confined between wetting solids.
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.
Delville
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A
CRMD, CNRS, 1b rue de la Férollerie, Orléans, France.
Letellier
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M
D009682:Magnetic Resonance Spectroscopy; D009010:Monte Carlo Method; D017640:Silicates; D014867:Water
D017640:Silicates; D014867:Water; C013547:hectorite