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DY: Dynamik und Statistische Physik

DY 33: Ferrofluids and Liquid Crystals

DY 33.3: Talk

Monday, March 7, 2005, 14:30–14:45, TU H2032

Ferrofluid controlled by ac-fields — •Robert Krauss, Reinhard Richter, and Ingo Rehberg — Experimentalphysik V, Universität Bayreuth

Considering the effect of pumping ferrofluid by a rotating field [1] and its theoretical description, led us to the conclusion that the mechanism should work in the same manner with ferrofluid droplets. Thus we arranged an experimental setup where magnetic liquid droplets swimming on the surface of another non-permeable liquid move linearly in a rotating field. The velocity of the droplets is changed depending on the applied ac-field strength and frequency as well as the size of the droplets (making a size seperation possible). With some modifications to the field geometry the droplets can be forced to make any 2-dimensional movement on the surface plane.

[1] R. Krauss et al., Fluid pumped by magnetic stress, Appl. Phys. Lett. accepted