Volume 74, Number 4, May 2006
|Page(s)||719 - 725|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||07 April 2006|
Surmounting barriers: The benefit of hydrodynamic interactions
2. Physikalisches Institut, Universität Stuttgart - Pfaffenwaldring 57 D-70550 Stuttgart, Germany
2 Universität Konstanz, Fachbereich Physik - D-78457 Konstanz, Germany
3 Max-Planck Institute for Dynamics and Self-Organization - Bunsenstr. 10 D-37073 Göttingen, Germany
Corresponding author: firstname.lastname@example.org
Accepted: 9 March 2006
We experimentally and theoretically investigate the collective behavior of three colloidal particles that are driven by a constant force along a toroidal trap. Due to hydrodynamic interactions, a characteristic limit cycle is observed. When we additionally apply a periodic sawtooth potential, we find a novel caterpillar-like motional sequence that is dominated by hydrodynamic interactions and promotes the surmounting of potential barriers by the particles.
PACS: 82.70.Dd – Colloids / 67.40.Hf – Hydrodynamics in specific geometries, flow in narrow channels / 83.80.Hj – Suspensions, dispersions, pastes, slurries, colloids
© EDP Sciences, 2006
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