Dresden 2006 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 24: POSTER Microfluidics

CPP 24.3: Poster

Thursday, March 30, 2006, 17:00–19:00, P2

Hydrodynamic interactions in Brownian ratchets — •Andrej Grimm and Holger Stark — Universität Konstanz, Fachbereich Physik, 78457 Konstanz

Brownian ratchets are often used as model systems for molecular motors such as kinesin and myosin [1]. These proteins always work in an aqueous enviroment. It has recently been shown that hydrodynamic interactions play an important role and lead to a novel type of dynamics of colloidal particles driven by a tilted sawtooth potential [2]. Using Brownian dynamics simulations, we study the influence of hydrodynamic interactions on Brownian ratchets. We consider particles in toroidal traps moving under the influence of an on-off sawtooth potential. Our objective is to investigate how the velocity of the particles depends on the relevant parameters of the potential and on the particle density.

[1] F. Jülicher, A. Ajdari, J. Prost, Rev. of Mod. Phys. 69, 1269 (1997)

[2] C. Lutz, M. Reichert, H. Stark, C. Bechinger, cond-mat/0510135 (2005)