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Clays and Clay Minerals; April 1999; v. 47; no. 2; p. 192-200
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Monte Carlo simulation of the total radial distribution function for interlayer water in sodium and potassium montmorillonites

Garrison Sposito, Sung-Ho Park, and Rebecca Sutton

Lawrence Berkeley National Laboratory, Earth Sciences Division, Berkeley, CA, United States

Monte Carlo simulations based on tested water-water, cation-water, and water-clay potential functions were applied to calculate radial distribution functions for O-O, O-H and H-H spatial correlations in the interlayer region of the two-layer hydrates of Na- and K-montmorillonite. The simulated radial distribution functions then were used to compute the total radial distribution function for interlayer water, a physical quantity that can be determined experimentally by H/D isotopic-difference neutron diffraction. The simulated total radial distribution functions were compared with that for bulk liquid water, and with a total radial distribution function determined experimentally for the two-layer hydrate of Na-montmorillonite by Powell et al. (1997). This comparison suggested that water molecules in the two-layer hydrate of montmorillonite have nearest-neighbor configurations which differ significantly from the tetrahedral ordering of nearest neighbors that characterizes bulk liquid water.

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