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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 4: Colloidal Fluids

CPP 4.3: Vortrag

Montag, 25. Februar 2008, 15:00–15:15, C 264

Computer Simulation of Colloidal Electrophoresis — •Burkhard Duenweg¹, Vladimir Lobaskin^1,2, Krishnan Seethalakshmy-Hariharan¹, and Christian Holm^1,3 — ¹Max-Planck-Institut fuer Polymerforschung Mainz — ²Physik-Department, TU Muenchen — ³FIAS Frankfurt

We study the motion of a charged colloidal sphere surrounded by solvent, counterions, and salt ions, under the influence of an external electric field. The ions are modeled as particles which interact dissipatively with a lattice Boltzmann background, such that hydrodynamic interactions are taken into account. Similarly, the colloid is modeled as a spherical array of such point particles. Finite concentration values are taken into account by simulating the system in a box with periodic boundary conditions. In terms of dimensionless reduced parameters, the results compare favorably with experimental data. As a complementary approach, we solve the electrokinetic equations by a finite element method.