Berlin 2012 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 25: Brownian Motion and Transport
DY 25.7: Talk
Thursday, March 29, 2012, 11:30–11:45, MA 004
Entropic Splitter: Particle Separation by entropic rectification — •Gerhard Schmid1, David Reguera2, Antoni Luque2, Sekhar Burada3, Miguel Rubi2, and Peter Hanggi1 — 1University of Augsburg, Germany — 2Universitat de Barcelona, Spain — 3MPIPKS Dresden, Germany
Diffusive transport of particles or, more generally, small objects, is a ubiquitous feature of physical and chemical reaction systems. In configurations containing confining walls or constrictions, transport is controlled both by the fluctuation statistics of the jittering objects and the phase space available to their dynamics. In the talk I will report on recent advances in the theoretical and numerical investigation of stochastic transport occurring in geometries of varying cross sections.
In nanopores lacking mirror symmetry about a vertical axis rectification favoring transport in one pore direction occurs [1]. The combined action of a time-dependent driving force and this Entropic Rectification can be utilized for particle separation with respect to the particle size [2]. The mechanisms turned out to be very efficient and can be controlled by tuning the geometrical parameters of the pore leading to different velocities and directions of the particles.
[1] G. Schmid, P.S. Burada, P. Talkner, and P. Hänggi, Adv. Solid State Phys. 48, 317 (2009).
[2] D. Reguera, A. Luque, P.S. Burada, G. Schmid, J. M. Rubi, and P. Hänggi, to appear in Phys. Rev. Lett. (2012).