Berlin 2015 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 45: P10: Colloids and Complex Liquids

CPP 45.5: Poster

Mittwoch, 18. März 2015, 10:00–13:00, Poster A

Contribution to a benchmark test on thermodiffusion in an organic ternary mixture — •Matthias Gebhardt and Werner Köhler — Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany

The knowledge of diffusive mass transport in liquid mixtures is important for several natural and technological processes. Especially in the presence of a temperature gradient, where the local composition of a mixture is linked to an inhomogeneous temperature field. In the last decades binary mixtures were investigated in detail and a significant data base has been established. Today, experiments are going one step further and are challenging ternary mixtures. However, first results of multicomponent experiments performed by different groups and methods have shown the difficulties and complexity of this scientific subject. Furthermore, gravity can have a destabilizing effect on many of these diffusion experiments. Therefore, an international community has decided to establish benchmark values for the diffusion, thermodiffusion and Soret coefficients of the organic ternary mixture 0.8/0.1/0.1 (mass fraction) of 1,2,3,4-tetrahydronaphthalene, isobutylbenzene and n-dodecane in microgravity environment aboard the International Space Station (ISS) and on ground. We are presenting our contribution to this benchmark test by means of a two-color optical beam deflection technique.