Berlin 2012 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 25: Brownian Motion and Transport

DY 25.12: Vortrag

Donnerstag, 29. März 2012, 12:45–13:00, MA 004

Directional motion and anomalous diffusion of particles in viscosity landscapes — •Alexei Krekhov, Markus Burgis, and Walter Zimmermann — Physikalisches Institut, Universität Bayreuth, 95440 Bayreuth, Germany

Anomalous diffusion of Brownian particles in inhomogeneous viscosity landscapes is analyzed in the framework of a Langevin equation and a complementary Fokker-Planck equation. In the case of an ensemble of particles starting at a spatial minimum (maximum) of the viscous damping, we find subdiffusive (superdiffusive) motion. Superdiffusion also occurs in the case of a monotonically varying viscosity profile. External forces cause a particle drift in viscous media. We find that an interplay between particle drift and diffusion in the fluid with a spatio-temporal modulated viscosity may lead to an effective particle separation. Different systems for experimental investigations are discussed.