混合正构烷烃中索雷特系数的质量效应。

Mass effect on the Soret coefficient in n-alkane mixtures.

机构信息

Mechanical and Manufacturing Department, Engineering Faculty of Mondragon Unibertsitatea, Loramendi 4 Apdo. 23, 20500 Mondragon, Spain.

Department of Applied Physics II, University of Basque Country (UPV/EHU), Apdo. 644, 48080 Bilbao, Spain.

出版信息

J Chem Phys. 2014 Feb 28;140(8):084503. doi: 10.1063/1.4865936.

DOI:10.1063/1.4865936

PMID:24588181

Abstract

We have determined the Soret coefficient of different equimolar and non equimolar n-alkane mixtures from measurements of the molecular diffusion and thermal diffusion coefficients. It is shown that equimolar mixtures behave as isotopic-like mixtures in which only the mass effect contributes to the Soret effect. In non equimolar mixtures, a small linear dependence with the molar fraction is observed. Finally, we have obtained a new correlation, which allows the determination of the Soret coefficient of n-alkane mixtures using the data of viscosity, the thermal expansion coefficient of the pure components, and the density of the equimolar mixture.

摘要

我们已经通过测量分子扩散系数和热扩散系数来确定了不同等摩尔和非等摩尔正烷烃混合物的 Soret 系数。结果表明，等摩尔混合物表现为类似同位素的混合物，其中只有质量效应对 Soret 效应有贡献。在非等摩尔混合物中，观察到与摩尔分数的小线性关系。最后，我们得到了一个新的关联式，它允许使用粘度、纯组分的热膨胀系数和等摩尔混合物的密度数据来确定正烷烃混合物的 Soret 系数。