Comparison of molecular dynamics simulations with triple layer and modified Gouy-Chapman models in a 0.1 M NaCl-montmorillonite system

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:339

Article

Tournassat, Christophe¹  Chapron, Yves² 

[1] Bur Rech Geol & Minieres, Environm & Proc Div EPI MIS, French Geol Survey, F-45060 Orleans 2, France

[2] AIED, La Terrasse, France

关键词: Clay;    Molecular dynamics;    Gouy-Chapman;    Basic Stern model;    Triple layer model;    Cation exchange;    Diffusion;   

DOI  :  10.1016/j.jcis.2009.06.051

来源: Elsevier

【 摘 要 】

Molecular dynamics (MID) simulations of a montmorillonite/water interface at the pore scale were carried Out at 0.1 mol L-1 NaCl concentration in order to constrain cation, anion, and water distribution and mobility influenced by the mineral surface. MID results enabled anion exclusion and cation condensation at the surface to be quantified. MID-derived values could then be compared with macroscopic model results obtained from the Modified Gouy-Chapman (MGC) theory. While the Na concentration profile is well reproduced in the diffuse layer, anion exclusion is overestimated by the MGC theory under our experimental conditions. We also showed that MID simulations can be used to constrain Basic Stern model parameters or, in combination with zeta potential measurements, can be used to constrain triple layer model (TLM) parameters by providing suitable values for the capacitance values. Na sorption intrinsic equilibrium constant values for clay basal surfaces are given accordingly. (C) 2009 Elsevier Inc. All rights reserved.

【 授权许可】

Free