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Monte Carlo Simulation of Interlayer Molecular Structure in Swelling Clay Minerals. 2. Monolayer Hydrates

Published online by Cambridge University Press:  28 February 2024

N. T. Skipper ,
Garrison Sposito  and
Fang-Ru Chou Chang
N. T. Skipper
Affiliation:
Department of Physics and Astronomy, University College, Gower Street, London WC1E 6BT, UK
Garrison Sposito
Affiliation:
Department of Environmental Science, Policy, and Management, University of California, Berkeley, California 94720-3110
Fang-Ru Chou Chang
Affiliation:
Department of Environmental Science, Policy, and Management, University of California, Berkeley, California 94720-3110
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Abstract

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Monte Carlo (MC) simulations of interlayer molecular structure in monolayer hydrates of Na-saturated Wyoming-type montmorillonites and vermiculite were performed. Detailed comparison of the stimulation results with experimental diffraction and thermodynamic data for these clay-water systems indicated good semiquantitative to quantitative agreement. The MC simulations revealed that, in the monolayer hydrate, interlayer water molecules tend to increase their occupation of the midplane as layer charge increases. As the percentage of tetrahedral layer charge increases, water molecules are induced to interact with the siloxane surface O atoms through hydrogen bonding and Na+ counter-ions are induced to form inner-sphere surface complexes. These results suggest the need for careful diffraction experiments on a series of monolayer hydrates of montmorillonite whose layer charge and tetrahedral isomorphic substitution charge vary systematically.

Keywords

Clay water systemsMonte Carlo simulationswelling clays
Type
Research Article
Information
Clays and Clay Minerals , Volume 43 , Issue 3 , June 1995 , pp. 294 - 303
Copyright
Copyright © 1995, The Clay Minerals Society

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