Dresden 2009 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 39: POSTERS Colloids and Liquids

CPP 39.19: Poster

Thursday, March 26, 2009, 17:00–19:30, P3

Colloidal particles in microchannels — Christian Klix and •Christian Kreuter — Universität Konstanz

Transport behavior of interacting particles through narrow constrictions is of high importance for many processes, e. g. for the size selectivity in ion channels. Due to the fact that these systems are very complex, only hypotheses of the underlying physics can be made. Experimentally easily accessible model systems can reveal the processes gouverning such phenomena. Over the last years colloidal systems have become a standard approach to model and simulate real systems. In our experiments, we use either superparamagnetic particles or particles with metallic caps. These latter particles can exhibit permanent magnetic dipole moments. We investigate the transport behavior of such interacting particles, gravitationally driven through narrow channels defined by optical lithography. Various potential shapes can be defined by crossings of channels or by channels with structured walls. Furthermore, we modify the transport behavior through realisation of barriers perpendicular to the particle flow.