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arXiv 2005.12221cond-mat.soft
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分子动力学模拟研究NaCl甲醇溶液的性质

On the properties of methanolic NaCl solution by molecular dynamics simulations

M. Cruz Sanchez, H. Dominguez, O. Pizio

摘要:

采用等温等压分子动力学模拟研究了NaCl盐溶于甲醇溶剂的模型溶液的微观结构和主要热力学性质。研究了甲醇的四种统一原子力场。关于离子溶质,我们使用Joung-Cheatham、Smith-Dang模型以及Vrabec实验室的模型。我们的主要重点是评估这些解决方案的基本属性的模型的不同组合的预测质量。具体而言,我们探讨了密度对质量摩尔浓度的变化,各种对分布函数,配位数,离子对数和平均氢键数方面的结构特性。此外,还描述了物种自扩散系数、溶剂介电常数和表面张力随离子浓度的变化。

英文摘要:

Isothermal-isobaric molecular dynamics simulations are used to examine the microscopic structure and principal thermodynamic properties of a model solution consisting of NaCl salt dissolved in methanol solvent. Four united atom force fields for methanol are involved. Concerning ion solutes we used the Joung-Cheatham, Smith-Dang models as well as the model from the laboratory of Vrabec. Our principal focus is to evaluate the quality of predictions of different combinations of models for basic properties of these solutions. Specifically, we explored the change of density on molality, the structural properties in terms of various pair distribution functions, the coordination numbers, the number of ion pairs and the average number of hydrogen bonds. In addition, changes of the self-diffusion coefficients of species, the solvent dielectric constant and the evolution of the surface tension with ion concentration are described.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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