Separation quality of a geometric ratchet

Details Separation quality of a geometric ratchet Separation quality of a geometric ratchet

2001-12-14

arxiv.org/abs/cond-mat/0112275v1

Phys. Rev. E 65, 041927 (2002).

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevE.65.041927

We consider an experimentally relevant model of a geometric ratchet in which particles undergo drift and diffusive motion in a two-dimensional periodic array of obstacles, and which is used for the continuous separation of particles subject to different forces. The macroscopic drift velocity and diffusion tensor are calculated by a Monte-Carlo simulation and by a master-equation approach, using the correponding microscopic quantities and the shape of the obstacles as input. We define a measure of separation quality and investigate its dependence on the applied force and the shape of the obstacles.

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