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arXiv 1703.09288cond-mat.stat-mechcond-mat.soft
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电解质溶液中水-水关联的平均场论

Mean-Field Theory of Water-Water Correlations in Electrolyte Solutions

David M. Wilkins, David E. Manolopoulos, Sylvie Roke, Michele Ceriotti

摘要:

最近在电解质溶液的飞秒弹性二次谐波散射实验中观察到了长程离子诱导的水-水关联。为了进一步定性理解这些相关性,我们推导出一个解析表达式,量化的离子诱导的偶极偶极相关性在非相互作用的气体的偶极子。该模型是德拜-休克尔理论的逻辑延伸,可用于定性地理解离子的组合电场如何在水溶液中诱导水分子取向分布的相关性。该模型与分子动力学模拟的结果一致,并为进一步的理论工作提供了一个重要的起点。

英文摘要:

Long-range ion induced water-water correlations were recently observed in femtosecond elastic second harmonic scattering experiments of electrolyte solutions. To further the qualitative understanding of these correlations, we derive an analytical expression that quantifies ion induced dipole-dipole correlations in a non-interacting gas of dipoles. This model is a logical extension of Debye-Hückel theory that can be used to qualitatively understand how the combined electric field of the ions induces correlations in the orientational distributions of the water molecules in an aqueous solution. The model agrees with results from molecular dynamics simulations and provides an important starting point for further theoretical work.

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