期刊
PHYSICAL REVIEW E
卷 94, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.94.012611
关键词
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资金
- Technion VPR fund
- EU Marie Curie CIG Grant [2018620]
- U.S. National Science Foundation [DMS-1409940]
- Division Of Mathematical Sciences
- Direct For Mathematical & Physical Scien [1409940] Funding Source: National Science Foundation
We present a microfield approach for studying the dependence of the orientational polarization of the water in aqueous electrolyte solutions upon the salt concentration and temperature. The model takes into account the orientation of the solvent dipoles due to the electric field created by ions, and the effect of thermal fluctuations. The model predicts a dielectric functional dependence of the form epsilon(c) = epsilon(w) - beta L(3 alpha c/beta), beta = epsilon(w) - e(ms), where L is the Langevin function, c is the salt concentration, e(w) is the dielectric of pure water, e(ms) is the dielectric of the electrolyte solution at the molten salt limit, and alpha is the total excess polarization of the ions. The functional form gives a remarkably accurate description of the dielectric constant for a variety of salts and a wide range of concentrations.
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