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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster: Colloids and Complex Liquids

CPP 37.15: Poster

Mittwoch, 24. März 2010, 17:30–19:00, Poster B2

Single Colloid Electrophoresis in the Presence of Multivalent Counterions — •Shervin Raafatnia and Christian Holm — Institute for Computational Physics, Stuttgart University, Pfaffendwaldring 27, 70569 Stuttgart, Germany

We study the electrophoretic behaviour of a single colloidal particle by simulation. We take into account hydrodynamic interactions via a Lattice Boltzmann fluid. A raspberry-like model is used for the colloidal particle in order to couple it to the fluid.

The electrophoretic behaviour depends on the concentration and valency of counterions in the suspension. Charge inversion, that will lead to a mobility reversal, is expected for multivalent counter ions, because many oppositely charged counterions attach to the colloid.