Dynamic analysis of the light scattered by the non-equilibrium fluctuations of a ternary mixture of polystyrene-toluene-n-hexane

  • Henri Bataller
  • Thomas Triller
  • Bastian Pur
  • Werner Köhler
  • José Maria Ortiz de Zárate
  • Fabrizio Croccolo
Regular Article

DOI: 10.1140/epje/i2017-11522-8

Cite this article as:
Bataller, H., Triller, T., Pur, B. et al. Eur. Phys. J. E (2017) 40: 35. doi:10.1140/epje/i2017-11522-8
Part of the following topical collections:
  1. Non-isothermal transport in complex fluids

Abstract.

Dynamic analysis of the light scattered by non-equilibrium fluctuations in a thermodiffusion experiment has been performed on a sample of polystyrene-toluene-n -hexane, at 0.9-49.55-49.55% mass fraction. Time decays of the non-equilibrium fluctuations have been obtained revealing the accurate detectability of three modes. The slowest mode has been attributed to the mass diffusion of the polymer into the binary solvent; the intermediate one to mass diffusion of the two molecular components of the solvent; finally, the fastest one has been attributed to the thermal diffusivity of the overall mixture. The two eigenvalues of the mass diffusion matrix have been evaluated with accuracy in the order of 1%. Neglecting cross-diffusion effects we obtain a simplified expression for the relative amplitude of the two mass diffusion modes, allowing a parameterized determination of polystyrene and toluene Soret coefficients in the ternary mixture. We suggest that a two wavelength shadowgraph experiment is needed for a complete determination of all the coefficients.

Graphical abstract

Keywords

Topical Issue: Non-isothermal transport in complex fluids 

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Henri Bataller
    • 1
  • Thomas Triller
    • 2
  • Bastian Pur
    • 2
  • Werner Köhler
    • 2
  • José Maria Ortiz de Zárate
    • 3
  • Fabrizio Croccolo
    • 1
    • 4
  1. 1.Univ Pau & Pays Adour, CNRS, TOTAL, LFCR-IPRA, UMR5150AngletFrance
  2. 2.Physikalisches InstitutUniversität BayreuthBayreuthGermany
  3. 3.Departamento de Física AplicadaUniversidad ComplutenseMadridSpain
  4. 4.Centre National d’Etudes Spatiales (CNES)ParisFrance

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