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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 43: Colloids and Complex Liquids II

CPP 43.11: Talk

Thursday, March 25, 2010, 16:45–17:00, H39

Colloidal particles in microchannels: transport in confined geometries — •Christian Kreuter, Paul Leiderer, and Artur Erbe — University of Konstanz, Germany

Understanding of biological systems requires detailed knowledge of the transport behavior of interacting particles. Since real-life systems are typically very complex, experimentally easily accessible systems have to be investigated in order to understand the fundamental physics underlying the collective behavior. During the last years, studies of colloidal systems have become a standard approach to model and simulate real systems. In our experiments we use superparamagnetic particles and investigate the transport behavior of such interacting particles gravitationally driven through narrow channels defined by optical lithography. With this experimental system we can realize various potential shapes by crossings of channels or channels with structured walls. Furthermore we modify the transport behavior through realization of barriers perpendicular to the channel. These systems resemble, for example, transport through ion channels or electron transport in mesoscopic systems.