Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 39: Colloids and Complex Liquids II - Dynamics and Mechanical Properties
CPP 39.5: Vortrag
Donnerstag, 17. März 2011, 11:30–11:45, ZEU 222
Transport studies of colloidal systems through channels and across barriers — •Christian Kreuter1, Peter Nielaba1, Paul Leiderer1, and Artur Erbe2 — 1Universitaet Konstanz — 2Helmholtz-Zentrum Dresden-Rossendorf
Colloidal particles are ideal model systems for processes on a mesoscopic scale, because the energies, which are determined by the interactions of the particles, are on the same range as the thermal energy provided by the solvent. In these studies we investigate the behavior of superparamagnetic particles, which are driven gravitationally through narrow channels and across lithographically defined barriers. Such systems model many aspects of the behavior of charge carriers in nanoscale conductors. By comparing the experimental results with Brownian dynamics simulations, we can explore a large range of parameters and mimic a large number of known situations. Especially, we find ordering processes, which are induced by the interparticle interactions caused by the magnetic dipole moments of the particles. This leads to a movement of the particles in layers and strongly affects the diffusion behavior of the system.