液体的热疏性：混合物中的输运热作为纯组分性质——任意浓度的情况。

Thermophobicity of liquids: heats of transport in mixtures as pure component properties--the case of arbitrary concentration.

作者信息

Hartmann S, Wittko G, Schock F, Gross W, Lindner F, Köhler W, Morozov K I

机构信息

Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany.

Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel.

出版信息

J Chem Phys. 2014 Oct 7;141(13):134503. doi: 10.1063/1.4896776.

DOI:10.1063/1.4896776

PMID:25296817

Abstract

We have measured Soret coefficients of a large number of binary mixtures of 23 different organic solvents. The present analysis is based on 77 equimolar mixtures and strongly supports the thermophobicity concept previously developed for the heats of transport of originally 10 different substances [S. Hartmann, G. Wittko, W. Köhler, K. I. Morozov, K. Albers, and G. Sadowski, Phys. Rev. Lett. 109, 065901 (2012)]. Among the investigated compounds, cis-decalin is the most thermophobic, hexane the most thermophilic one. In addition to the equimolar mixtures, we have also analyzed the composition dependence of the Soret coefficients and the heats of transport for 22 selected binary mixtures. Both the interpretation of the heats of transport in equimolar mixtures as pure component thermophobicities and the composition dependence of the Soret coefficient can be understood on the basis of the thermodiffusion theory developed by Morozov [Phys. Rev. E 79, 031204 (2009)], according to which the composition dependence is determined by the excess volume of mixing.

摘要

我们测量了23种不同有机溶剂的大量二元混合物的索雷特系数。目前的分析基于77种等摩尔混合物，并有力地支持了先前针对最初10种不同物质的传输热所提出的热疏性概念[S. Hartmann, G. Wittko, W. Köhler, K. I. Morozov, K. Albers, and G. Sadowski, Phys. Rev. Lett. 109, 065901 (2012)]。在所研究的化合物中，顺式十氢化萘是热疏性最强的，己烷是热亲性最强的。除了等摩尔混合物，我们还分析了22种选定二元混合物的索雷特系数和传输热对组成的依赖性。根据莫罗佐夫提出的热扩散理论[Phys. Rev. E 79, 031204 (2009)]，等摩尔混合物中传输热作为纯组分热疏性的解释以及索雷特系数对组成的依赖性都可以得到理解，根据该理论，组成依赖性由混合过量体积决定。