Issue
EPL
Volume 84, Number 1, October 2008
Article Number 10014
Number of page(s) 6
Section General
DOI http://dx.doi.org/10.1209/0295-5075/84/10014
Published online 01 October 2008
EPL, 84 (2008) 10014
DOI: 10.1209/0295-5075/84/10014

Efficiency of Brownian motors in terms of entropy production rate

Min Qian1, Xuejuan Zhang1, 2, R. J. Wilson2 and Jianfeng Feng2, 3

1   Shaoxing College of Arts and Sciences - Zhejiang Province 312000, PRC
2   Department of Computer Science, Warwick University - Coventry CV4 7AL, UK, EU
3   Centre for Computational System Biology, Fudan University - Shanghai 210000, PRC

xuejuanzhang@gmail.com.

received 23 February 2008; accepted in final form 29 August 2008; published October 2008
published online 1 October 2008

Abstract
This paper presents a novel approach to the investigation of the efficiency of Brownian motors in the framework of nonequilibrium theory. We derive an explicit expression of the entropy production rate (EPR) for a chemically driven Brownian motor and use this to develop an expression for motor efficiency in terms of the EPR. Our result is consistent with earlier derivations but is more general and physically transparent and thus applicable to a wider range of biological motors.

PACS
05.40.-a - Fluctuation phenomena, random processes, noise, and Brownian motion.
87.10.-e - Biological and medical physics: General theory and mathematical aspects.

© EPLA 2008