Regensburg 2010 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Poster: Liquids and Ionic Liquids

CPP 32.1: Poster

Mittwoch, 24. März 2010, 17:30–19:00, Poster C

Additivity of the heats of transport in binary liquids — •Steffen Hartmann¹, Gerhard Wittko¹, Werner Köhler¹, Katja Albers², Feelly Rüther², and Gabriele Sadowski² — ¹Physikalisches Institut, Universität Bayreuth — ²Fakultät Bio- und Chemieingenieurwesen, Universität Dortmund

The coupling between heat and mass transport in multicomponent systems under the presence of a temperature gradient is quantitatively expressed by the Soret coefficient. This coefficient contains true non-equilibrium quantities, the so-called heats of transport, and a thermodynamic factor that can be obtained from equilibrium properties. We have measured the Soret coefficients of a large number of binary mixtures of organic solvents and found an additive model for the heats of transport of equimolar mixtures with a high correlation between predicted and measured values. The necessary thermodynamic factors, which contain the activity coefficients, have been determined from the PC-SAFT equation of state and the group contribution method Modified UNIFAC (Dortmund). Our results show, how the components can be ordered according to their thermophobicity.