Cited by 115Clay minerals and soil interactionsNanopore and Nanochannel Transport StudiesPolymer Nanocomposites and Properties

Molecular Dynamics Simulation of Diffusion and Electrical Conductivity in Montmorillonite Interlayers

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Greathouse, J. A., Cygan, R. T., Fredrich, J. T., Jerauld, G. R.·2016·The Journal of Physical Chemistry C

Abstract

The diffusion of water and ions in the interlayer region of smectite clay minerals represents a direct probe of the type and strength of clay–fluid interactions. Interlayer diffusion also represents an important link between molecular simulation and macroscopic experiments. Here we use molecular dynamics simulation to investigate trends in cation and water diffusion in montmorillonite interlayers, looking specifically at the effects of layer charge, interlayer cation and cation charge (sodium or calcium), water content, and temperature. For Na-montmorillonite, the largest increase in ion and water diffusion coefficients occurs between the one-layer and two-layer hydrates, corresponding to the transition from inner-sphere to outer-sphere surface complexes. Calculated activation energies for ion and water diffusion in Na-montmorillonite are similar to each other and to the water hydrogen bond energy, suggesting the breaking of water–water and water–clay hydrogen bonds as a likely mechanism for interlayer diffusion. A comparison of interlayer diffusion with that of bulk electrolyte solutions reveals a clear trend of decreasing diffusion coefficient with increasing electrolyte concentration, and in most cases the interlayer diffusion results are nearly coincident with the corresponding bulk solutions. Trends in electrical conductivities computed from the ion diffusion coefficients are also compared.

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Crossref · 10.1021/acs.jpcc.5b10851

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  1. Liang J. J., 1998, Can. Mineral., 36, 1017

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Authors
Greathouse, J. A., Cygan, R. T., Fredrich, J. T., & Jerauld, G. R.
Affiliations
  • Sandia National Laboratories (US)
  • BP (United States) (US)
Corresponding author
Greathouse, J. A.
Venue
The Journal of Physical Chemistry C
Published
2016-01-20
Volume
120
Issue
3
Pages
1640-1649
ISSN
  • 1932-7447 (ISSN-L)
  • 1932-7455
OpenAlex
W2417977945
Cited by
115
References
70
Citations by year
2026: 10 · 2025: 16 · 2024: 14 · 2023: 12 · 2022: 12 · 2021: 7 · 2020: 10 · 2019: 13 · 2018: 8 · 2017: 9 · 2016: 4
FWCI
4.15
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physical Chemistry C (publishedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
Funders
  • National Nuclear Security Administration (DE-AC04- 94AL85000)
  • BP America
Topics
  • Physical Sciences › Materials Science › Biomaterials › Clay minerals and soil interactions
  • Physical Sciences › Engineering › Biomedical Engineering › Nanopore and Nanochannel Transport Studies
  • Physical Sciences › Materials Science › Polymers and Plastics › Polymer Nanocomposites and Properties
Keywords
montmorillonite, interlayer diffusion, ion diffusion, water diffusion, electrical conductivity, smectite clay minerals, sodium montmorillonite, calcium montmorillonite, layer charge, interlayer cations, hydrogen bonding, activation energy, electrolyte concentration

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