Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: SYMPOSIUM Driven Soft Matter IV

CPP 19.5: Vortrag

Mittwoch, 27. Februar 2008, 15:00–15:15, C 130

2d-Motion of magnetic particles in external fields — •Artur Erbe, Peter Henseler, Michael Koeppl, Marcin Zientara, Peter Nielaba, and Paul Leiderer — Universitaet Konstanz, FB Physik, Konstanz, Germany

Magnetic colloidal particles are ideal model systems to study the behavior of particles, which interact via dipole-dipole interactions, under various conditions. Here we present studies of a two-dimensional system of micron-sized particles moving under the influence of an external field. The external force acting on the particles is either given by gravity or a gradient in the magnetic field. We study the motion of the particles by video microscopy and compare the results to molecular dynamics simulations. Layering and layer-reduction effects are observed, when the particles are driven through narrow channels. This behavior is explained by the interplay of the interparticle interactions and the influence of the confining walls. In unbounded systems we observe laning of the particles. We discuss possible origins for this behavior.