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Effects of shapes of solute molecules on diffusion : a study of dependences on solute size, solvent, and temperature

机译:溶质分子形状对扩散的影响:溶质尺寸,溶剂和温度的依赖性研究

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摘要

Diffusivities of basically linear, planar, and spherical solutes at infinite dilution in various solvents are studied to unravel the effects of solute shapes on diffusion. On the basis of the relationship between the reciprocal of diffusivity and the molecular volume of solute molecules with similar shape in a given solvent at constant temperature, the diffusivities of solutes of equal molecular volume but different shapes are evaluated and the effects due to different shapes of two equal-sized solute molecules on diffusion are determined. It is found that the effects are dependent on the size of the solute pairs studied. Evidence of the dependence of the solute-shape effects on solvent properties is also demonstrated and discussed. Here, some new diffusion data of aromatic compounds in methanol at different temperatures are reported. The result for methanol in this study indicates that the effects of solute shape on diffusivity are only weakly dependent on temperature.
机译:研究了在各种溶剂中无限稀释的基本线性,平面和球形溶质的扩散系数,以揭示溶质形状对扩散的影响。根据在给定的溶剂中恒定温度下扩散率的倒数与形状相似的溶质分子的分子体积之间的关系,评估分子体积相同但形状不同的溶质的扩散率,以及不同形状的溶质的影响确定了两个相同大小的溶质分子在扩散时的状态。发现效果取决于所研究的溶质对的大小。还证明和讨论了溶质形状效应对溶剂性能的依赖性。在此,报道了在不同温度下芳族化合物在甲醇中的一些新扩散数据。这项研究中甲醇的结果表明,溶质形状对扩散率的影响仅微弱地依赖于温度。

著录项

  • 作者

    Chan, TC; Li, HT; Li, KY;

  • 作者单位
  • 年度 2015
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  • 原文格式 PDF
  • 正文语种 en
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