Steering the potential barriers: entropic to energetic

Details Steering the potential barriers: entropic to energetic Steering the potential barriers: entropic to energetic

2010-10-04

arxiv.org/abs/1010.0611v1

Phys. Rev. E 82, 051128 (2010)

Physics

Condensed Matter

Statistical Mechanics

(6 pages, 7 figures) Submitted to PRE

Scientific paper

10.1103/PhysRevE.82.051128

We propose a new mechanism to alter the nature of the potential barriers when a biased Brownian particle under goes a constrained motion in narrow, periodic channel. By changing the angle of the external bias, the nature of the potential barriers changes from purely entropic to energetic which in turn effects the diffusion process in the system. At an optimum angle of the bias, the nonlinear mobility exhibits a striking bell-shaped behavior. Moreover, the enhancement of the scaled effective diffusion coefficient can be efficiently controlled by the angle of the bias. This mechanism enables the proper design of channel structures for transport of molecules and small particles. The approximative analytical predictions have been verified by precise Brownian dynamic simulations.

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