Molecular dynamics simulations of the colloidal interaction between smectite clay nanoparticles in liquid water
Abstract
Colloidal interactions between clay nanoparticles have been studied extensively because of their strong influence on the hydrology and mechanics of many soils and sedimentary media. The predominant theory used to describe these interactions is the Derjaguin-Landau-Verwey-Overbeek (DLVO) model, a framework widely applied in colloidal and interfacial science that accurately predicts the interactions between charged surfaces across water films at distances greater than ~ 3 nm (i.e., ten water monolayers). Unfortunately, the DLVO model is inaccurate at the shorter interparticle distances that predominate in most subsurface environments. For example, it inherently cannot predict the existence of equilibrium states wherein clay particles adopt interparticle distances equal to the thickness of one, two, or three water monolayers. Molecular dynamics (MD) simulations have the potential to provide detailed information on the free energy of interaction between clay nanoparticles; however, they have only been used to examine clay swelling and aggregation at interparticle distances below 1 nm. We present the first MD simulation predictions of the free energy of interaction of smectite clay nanoparticles in the entire range of interparticle distances from the large interparticle distances where the DLVO model is accurate (>3 nm) to the short-range swelling states where non-DLVO interactions predominate (<1 nm).more »
- Authors:
- Publication Date:
- Research Org.:
- Princeton Univ., NJ (United States)
- Sponsoring Org.:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
- OSTI Identifier:
- 1770502
- Alternate Identifier(s):
- OSTI ID: 1784315
- Grant/Contract Number:
- SC0018419
- Resource Type:
- Published Article
- Journal Name:
- Journal of Colloid and Interface Science
- Additional Journal Information:
- Journal Name: Journal of Colloid and Interface Science Journal Volume: 584 Journal Issue: C; Journal ID: ISSN 0021-9797
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; molecular dynamics simulation; DLVO theory; clay swelling; disjoining pressure; adsorption; electrical double layer; colloidal aggregation
Citation Formats
Shen, Xinyi, and Bourg, Ian C. Molecular dynamics simulations of the colloidal interaction between smectite clay nanoparticles in liquid water. United States: N. p., 2021.
Web. doi:10.1016/j.jcis.2020.10.029.
Shen, Xinyi, & Bourg, Ian C. Molecular dynamics simulations of the colloidal interaction between smectite clay nanoparticles in liquid water. United States. https://doi.org/10.1016/j.jcis.2020.10.029
Shen, Xinyi, and Bourg, Ian C. Mon .
"Molecular dynamics simulations of the colloidal interaction between smectite clay nanoparticles in liquid water". United States. https://doi.org/10.1016/j.jcis.2020.10.029.
@article{osti_1770502,
title = {Molecular dynamics simulations of the colloidal interaction between smectite clay nanoparticles in liquid water},
author = {Shen, Xinyi and Bourg, Ian C.},
abstractNote = {Colloidal interactions between clay nanoparticles have been studied extensively because of their strong influence on the hydrology and mechanics of many soils and sedimentary media. The predominant theory used to describe these interactions is the Derjaguin-Landau-Verwey-Overbeek (DLVO) model, a framework widely applied in colloidal and interfacial science that accurately predicts the interactions between charged surfaces across water films at distances greater than ~ 3 nm (i.e., ten water monolayers). Unfortunately, the DLVO model is inaccurate at the shorter interparticle distances that predominate in most subsurface environments. For example, it inherently cannot predict the existence of equilibrium states wherein clay particles adopt interparticle distances equal to the thickness of one, two, or three water monolayers. Molecular dynamics (MD) simulations have the potential to provide detailed information on the free energy of interaction between clay nanoparticles; however, they have only been used to examine clay swelling and aggregation at interparticle distances below 1 nm. We present the first MD simulation predictions of the free energy of interaction of smectite clay nanoparticles in the entire range of interparticle distances from the large interparticle distances where the DLVO model is accurate (>3 nm) to the short-range swelling states where non-DLVO interactions predominate (<1 nm). Our simulations examine a range of salinities (0.0 to 1.0 M NaCl) and counterion types (Na, K, Ca) and establish a detailed picture of the breakdown of the DLVO model. In particular, they confirm previous theoretical suggestions of the existence of a strong non-DLVO attraction with a range of ~ 3 nm arising from specific ion-clay Coulomb interactions in the electrical double layer.},
doi = {10.1016/j.jcis.2020.10.029},
journal = {Journal of Colloid and Interface Science},
number = C,
volume = 584,
place = {United States},
year = {Mon Feb 01 00:00:00 EST 2021},
month = {Mon Feb 01 00:00:00 EST 2021}
}
https://doi.org/10.1016/j.jcis.2020.10.029
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