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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 25: Focus: Active Fluids

CPP 25.2: Hauptvortrag

Mittwoch, 24. März 2010, 10:00–10:30, H39

Magnetic actuation of paramagnetic colloids at interfaces — •Thomas Fischer — University of Bayreuth

Spatio temporal variations of a magnetic field allow the dynamic control of paramagnetic colloids near interfaces. The flux of magnetic energy into the colloidal system renders the colloid into an active fluid. We report on the structure, dynamics, and transport of active two dimensional paramagnetic colloids in magnetic fields that vary on the colloidal scale. Several novel dynamical regimes are observed and reported, from localized trajectories to direct particle transport, depending on the geometry of the underlying magnetic pattern and on the parameters, which control the external driving field, such as frequency, strength and direction.