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

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

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...

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Veröffentlicht in:The Journal of chemical physics 2014-10, Vol.141 (13), p.134503-134503
Hauptverfasser: Hartmann, S, Wittko, G, Schock, F, Gross, W, Lindner, F, Köhler, W, Morozov, K I
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container_end_page 134503
container_issue 13
container_start_page 134503
container_title The Journal of chemical physics
container_volume 141
creator Hartmann, S
Wittko, G
Schock, F
Gross, W
Lindner, F
Köhler, W
Morozov, K I
description 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.
doi_str_mv 10.1063/1.4896776
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title Thermophobicity of liquids: heats of transport in mixtures as pure component properties--the case of arbitrary concentration
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