二甲基亚砜-甲醇液体混合物的分子动力学模拟:力场对混合性质的影响
Molecular dynamics simulations of DMSO-MeOH liquid mixtures. Effects of force fields on mixing properties
- Universidad Autónoma Metropolitana-Iztapalapa(墨西哥自治 metropolitan 大学伊斯塔帕拉帕分校)
- Universidad Nacional Autónoma de México(墨西哥国立自治大学)
机构由 AI 辅助整理,请以论文原文为准。
AI总结:
本研究通过分子动力学模拟,系统评估了不同力场组合对DMSO-甲醇混合物密度、混合热、扩散及微观结构等性质预测的影响,并与实验对比验证模型质量。
AI中文摘要:
我们利用分子动力学计算机模拟,探讨了液态二甲基亚砜(DMSO)-甲醇(MeOH)液体混合物主要性质的组成依赖性。研究了一组非极化半柔性DMSO分子模型与甲醇模型的组合。评估了密度、过量混合体积和过量混合焓的组成趋势。此外,我们研究了物质自扩散系数、剪切粘度、静态介电常数及表面性质的组成依赖性。通过径向分布函数和平均氢键分子数分析了微观结构的各个方面。通过与实验数据的比较,说明并批判性评估了多种模型组合的质量。
英文摘要:
We explore composition dependence of the principal properties of liquid dimethylsulfoxide (DMSO)-methanol (MeOH) liquid mixtures by using molecular dynamics computer simulations. A set of non-polarizable semi-flexible models for the DMSO molecule combined with methanol models is investigated. Composition trends of density, excess mixing volume and excess mixing enthalpy are evaluated. Besides, we study the composition dependence of self-diffusion of species and shear viscosity ofthe static dielectric constant and the surface tension.Certain aspects of the microscopic structure are analyzedin terms of radial distribution functions and of the average number of hydrogen-bonded molecules. The quality of several combinations of the models is illustrated and critically evaluated by comparisons with experimental data.