Entropic transport of finite size particles - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




Entropic transport of finite size particles - Condensed Matter > Mesoscale and Nanoscale Physics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Transport of spherical Brownian particles of finite size possessing radiithrough narrow channels with varying cross-section area is considered. Applyingthe so-called Fick-Jacobs approximation, i.e. assuming fast equilibration inorthogonal direction of the channel axis, the 2D problem can be described by a1D effective dynamics in which bottlenecks cause entropic barriers. Geometricalconfinements result in entropic barriers which the particles have to overcomein order to proceed in transport direction. The analytic findings for thenonlinear mobility for the transport are compared with precise numericalsimulation results. The dependence of the nonlinear mobility on the particlesize exhibits a striking resonance-like behavior as a function of the relativeparticle size; this latter feature renders possible new effective particleseparation scenarios.



Author: Wolfgang Riefler, Gerhard Schmid, P Sekhar Burada, Peter Hanggi

Source: https://arxiv.org/







Related documents