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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 54: Poster Session 3

CPP 54.35: Poster

Donnerstag, 3. April 2014, 15:00–19:00, P2

Soret diffusion in ternary organic liquid mixtures — •Matthias Gebhardt and Werner Köhler — Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany

Soret diffusion or thermodiffusion describes the coupling of the local composition of a mixture to a prescribed inhomogeneous temperature field. While significant progress has been achieved over the last decades both on the theoretical and the experimental side, truly multicomponent systems have hardly been considered so far. It is only recently that the focus of interest has turned from binaries to ternaries, which show already a strongly increased complexity in their diffusion behaviour. We have investigated the system of dodecane, isobutylbenzene and 1,2,3,4-tetrahydronaphthalene by means of a two color optical beam deflection technique. For this system the binary edges are well known in literature and can be used as limiting reference. We have developed a fitting routine to evaluate our experimental data based on the idea of Haugen [1]. Now, we are presenting the first results of our ternary measurements over the entire concentration range.

[1] K. B. Haugen and A. Firoozabadi, J. Phys. Chem. B, 110, pp. 17678-17682 (2006)