Wednesday, September 26, 2012

1209.5646 (S. Martens et al.)

Hydrodynamically enforced entropic trapping of Brownian particles    [PDF]

S. Martens, A. V. Straube, G. Schmid, L. Schimansky-Geier, P. Hänggi
We generalize the Fick-Jacobs approach to vector potentials, describing the dynamics of Brownian particles in laminar flows in a corrugated channel. Performing the long-wave analysis, we derive an effective one-dimensional description involving the potential of mean force. Particle transport is investigated at dilute concentrations induced by the interplay of a pressure-driven flow and an oppositely oriented constant bias. At a critical ratio of these counteracting tendencies, the diffusion is shown to become significantly suppressed via hydrodynamically enforced entropic particle trapping.
View original: http://arxiv.org/abs/1209.5646

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