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Title: Molecular simulation of structure and diffusion at smectite-water interfaces: Using expanded clay interlayers as model nanopores

Abstract

In geologic settings relevant to a number of extraction and potential sequestration processes, nanopores bounded by clay mineral surfaces play a critical role in the transport of aqueous species. Solution structure and dynamics at clay–water interfaces are quite different from their bulk values, and the spatial extent of this disruption remains a topic of current interest. We have used molecular dynamics simulations to investigate the structure and diffusion of aqueous solutions in clay nanopores approximately 6 nm thick, comparing the effect of clay composition with model Na-hectorite and Na-montmorillonite surfaces. In addition to structural properties at the interface, water and ion diffusion coefficients were calculated within each aqueous layer at the interface, as well as in the central bulk-like region of the nanopore. The results show similar solution structure and diffusion properties at each surface, with subtle differences in sodium adsorption complexes and water structure in the first adsorbed layer due to different arrangements of layer hydroxyl groups in the two clay models. Interestingly, the extent of surface disruption on bulk-like solution structure and diffusion extends to only a few water layers. Additionally, a comparison of sodium ion residence times confirms similar behavior of inner-sphere and outer-sphere surface complexes atmore » each clay surface, but ~1% of sodium ions adsorb in ditrigonal cavities on the hectorite surface. Thus, the presence of these anhydrous ions is consistent with highly immobile anhydrous ions seen in previous nuclear magnetic resonance spectroscopic measurements of hectorite pastes.« less

Authors:
 [1];  [1];  [2];  [3];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Alfred Univ., Alfred, NY (United States)
  3. Michigan State Univ., East Lansing, MI (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1235297
Alternate Identifier(s):
OSTI ID: 1237461
Report Number(s):
SAND-2015-5572J; SAND-2015-2329J
Journal ID: ISSN 1932-7447; 594962
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 119; Journal Issue: 30; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 58 GEOSCIENCES

Citation Formats

Greathouse, Jeffery A., Hart, David, Bowers, Geoffrey M., Kirkpatrick, R. James, and Cygan, Randall Timothy. Molecular simulation of structure and diffusion at smectite-water interfaces: Using expanded clay interlayers as model nanopores. United States: N. p., 2015. Web. doi:10.1021/acs.jpcc.5b03314.
Greathouse, Jeffery A., Hart, David, Bowers, Geoffrey M., Kirkpatrick, R. James, & Cygan, Randall Timothy. Molecular simulation of structure and diffusion at smectite-water interfaces: Using expanded clay interlayers as model nanopores. United States. https://doi.org/10.1021/acs.jpcc.5b03314
Greathouse, Jeffery A., Hart, David, Bowers, Geoffrey M., Kirkpatrick, R. James, and Cygan, Randall Timothy. Mon . "Molecular simulation of structure and diffusion at smectite-water interfaces: Using expanded clay interlayers as model nanopores". United States. https://doi.org/10.1021/acs.jpcc.5b03314. https://www.osti.gov/servlets/purl/1235297.
@article{osti_1235297,
title = {Molecular simulation of structure and diffusion at smectite-water interfaces: Using expanded clay interlayers as model nanopores},
author = {Greathouse, Jeffery A. and Hart, David and Bowers, Geoffrey M. and Kirkpatrick, R. James and Cygan, Randall Timothy},
abstractNote = {In geologic settings relevant to a number of extraction and potential sequestration processes, nanopores bounded by clay mineral surfaces play a critical role in the transport of aqueous species. Solution structure and dynamics at clay–water interfaces are quite different from their bulk values, and the spatial extent of this disruption remains a topic of current interest. We have used molecular dynamics simulations to investigate the structure and diffusion of aqueous solutions in clay nanopores approximately 6 nm thick, comparing the effect of clay composition with model Na-hectorite and Na-montmorillonite surfaces. In addition to structural properties at the interface, water and ion diffusion coefficients were calculated within each aqueous layer at the interface, as well as in the central bulk-like region of the nanopore. The results show similar solution structure and diffusion properties at each surface, with subtle differences in sodium adsorption complexes and water structure in the first adsorbed layer due to different arrangements of layer hydroxyl groups in the two clay models. Interestingly, the extent of surface disruption on bulk-like solution structure and diffusion extends to only a few water layers. Additionally, a comparison of sodium ion residence times confirms similar behavior of inner-sphere and outer-sphere surface complexes at each clay surface, but ~1% of sodium ions adsorb in ditrigonal cavities on the hectorite surface. Thus, the presence of these anhydrous ions is consistent with highly immobile anhydrous ions seen in previous nuclear magnetic resonance spectroscopic measurements of hectorite pastes.},
doi = {10.1021/acs.jpcc.5b03314},
journal = {Journal of Physical Chemistry. C},
number = 30,
volume = 119,
place = {United States},
year = {Mon Jul 20 00:00:00 EDT 2015},
month = {Mon Jul 20 00:00:00 EDT 2015}
}

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Cited by: 75 works
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Figures / Tables:

Figure 1 Figure 1: Snapshot of the hectorite simulation supercell representing the equilibrated nanopore structure. Atoms are colored as follows: Na (blue), O (red), H (white), Si (yellow), Li (purple), Mg (green).

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