Dresden 2003 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 23: Ferrofluids / Liquid crystals

DY 23.2: Vortrag

Dienstag, 25. März 2003, 12:00–12:15, G\"OR/229

The magnetic Soret effect — •Thomas Voelker and Stefan Odenbach — Zarm, Universitaet Bremen

Investigations were made to determine the Soret coefficient of magnetic particles in a ferrofluid under the influence of a magnetic field. This so called magnetic Soret effect was theoretically determined to be two to three orders of magnitude smaller than the conventional Soret effect. In contrast former experiments have shown that the magnetic Soret effect is much higher than the theoretical predictions. However in the experiments the influence of buoyancy and magnetic driven convection can not be excluded. So the question how large the magnetic Soret effect can be is still open. Thus an experimental setup was developed to minimize parasitic effects and thus to simplify the analysis of the experimental results. These results show that the magnetic Soret effect can even be higher as the conventional one and confirm therewith former experimental results.