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Journal of Non-Equilibrium Thermodynamics

Founded by Keller, Jürgen U.

Editor-in-Chief: Hoffmann, Karl Heinz

Managing Editor: Prehl, Janett / Schwalbe, Karsten

Ed. by Michaelides, Efstathios E. / Rubi, J. Miguel

4 Issues per year

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Volume 32, Issue 3 (Sep 2007)


Universal Concentration Dependence of the Soret Coefficient in Aqueous Systems

Simone Wiegand
  • Corresponding author
  • Research Center Juelich GmbH, IFF – Soft Matter, D-52425 Juelich, Germany.
  • Email:
/ Hui Ning
  • Research Center Juelich GmbH, IFF – Soft Matter, D-52425 Juelich, Germany.
/ Rio Kita
  • Department of Physics, Tokai University, Hiratsuka 259-1292, Japan.
Published Online: 2007-09-25 | DOI: https://doi.org/10.1515/JNETDY.2007.011


We present measurements of aqueous low molecular weight mixtures and aqueous macromolecular solutions. The Soret coefficient S T for ethanol, acetone, and DMSO in water was measured by an optical grating technique, and all systems showed a sign change around a molar fraction of water x water = 0.85 ± 0.05. S T for poly(ethylene oxide), poly(N-isopropylacrylamide), and boehmite rods in ethanol/water mixtures showed also a sign change close to the same concentration. The occurring sign change concentration in the systems will be related to structural reorganizations in the solvent mixture and the Hildebrandt solubility parameter. We will also compare the experimental data within lattice calculations and simulations, which indicate that strong cross-interactions are important for a sign change of the Soret coefficient.

About the article

Received: 2006-09-07

Accepted: 2006-10-26

Published Online: 2007-09-25

Published in Print: 2007-09-19

Citation Information: Journal of Non-Equilibrium Thermodynamics, ISSN (Print) 0340-0204, DOI: https://doi.org/10.1515/JNETDY.2007.011.

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