期刊
JOURNAL OF CHEMICAL PHYSICS
卷 142, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4906320
关键词
-
资金
- Department of Energy, Office of Basic Energy Sciences [DE-SC0002128]
The mean ionic activity coefficients of aqueous NaCl solutions of varying concentrations at 298.15 K and 1 bar have been obtained from molecular dynamics simulations by gradually turning on the interactions of an ion pair inserted into the solution. Several common non-polarizable water and ion models have been used in the simulations. Gibbs-Duhem equation calculations of the thermodynamic activity of water are used to confirm the thermodynamic consistency of the mean ionic activity coefficients. While the majority of model combinations predict the correct trends in mean ionic activity coefficients, they overestimate their values at high salt concentrations. The solubility predictions also suffer from inaccuracies, with all models underpredicting the experimental values, some by large factors. These results point to the need for further ion and water model development. (C) 2015 AIP Publishing LLC.
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