Berlin 2008 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 32: Colloid Dynamics

CPP 32.4: Talk

Thursday, February 28, 2008, 12:00–12:15, C 264

Dumbbell diffusion in a spatially periodic potential — •Jochen Bammert and Walter Zimmermann — Theoretische Physik I, Universität Bayreuth, D-95440 Bayreuth

We present a numerical investigation of the Brownian motion and diffusion of a dumbbell in a two-dimensional periodic potential. Its dynamics is described by a Langevin model including the hydrodynamic interaction. With increasing values of the amplitude of the potential we find along the modulated spatial directions a reduction of the diffusion and a reduction of hydrodynamic interaction effects on the dumbbell mobility. For modulation amplitudes in the range of the thermal energy the dumbbell diffusion exhibits a pronounced local maximum at a wavelength of about 3/2 of the dumbbell extension. This is especially emphasized for stiff springs connecting the two beads.