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How does thermodiffusion of aqueous solutions depend on concentration and hydrophobicity?

  • Kousaku MaedaEmail author
  • Naoki Shinyashiki
  • Shin Yagihara
  • Simone Wiegand
  • Rio Kita
Regular Article
Part of the following topical collections:
  1. Thermal non-equilibrium phenomena in multi-component fluids

Abstract.

The thermal diffusion of aqueous solutions of mono-, di-ethylene glycols, poly(ethylene glycol), methanol, and glycerol is investigated systematically as a function of concentration using the Thermal Diffusion Forced Rayleigh Scattering (TDFRS). For all investigated binary mixtures, the Soret coefficient, S T , decays with increasing concentration of the non-aqueous component showing two regions. For aqueous solution of ethylene glycol, at a very low solute content the decay is steep, while it becomes less steep for higher solute concentration. All mixtures show a sign change of S T with concentration. The sign change concentration is discussed with respect to chemical structures of solute molecules and the partition coefficient, log p . It turns out that the number of hydroxyl groups plays an important role. For the investigated aqueous mixtures, we find empirical linear relations between the sign change concentration and the ratio of the number of hydroxyl groups to the number of carbon atoms as well as the partition coefficient, log p .

Graphical abstract

Keywords

Topical Issue: Thermal non-equilibrium phenomena in multi-component fluids 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Kousaku Maeda
    • 1
    Email author
  • Naoki Shinyashiki
    • 1
  • Shin Yagihara
    • 1
  • Simone Wiegand
    • 2
    • 3
  • Rio Kita
    • 1
  1. 1.Graduate School of Science and TechnologyTokai UniversityKanagawaJapan
  2. 2.ICS-3 Soft Condensed MatterForschungszentrum Jülich GmbHJülichGermany
  3. 3.Department für Chemie - Physikalische ChemieUniversität zu KölnCologneGermany

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