標題: Reciprocating and Directed Motion on the Nanoscale: A Simple Kinetic Model
作者: Rozenbaum, V. M.
Makhnovskii, Yu. A.
Yang, D. -Y.
Sheu, S. -Y.
Lin, S. H.
應用化學系
Department of Applied Chemistry
公開日期: 11-二月-2010
摘要: We consider noise-induced reciprocating motion on the nanoscale and its rectification to directed motion using a simple model in which transitions between two fluctuating states occur through two reaction channels with fluctuating transition rates. The fluctuations of states and transition rates arise from equilibrium thermal and external nonthermal noise which is in either case position-dependent. The model is equivalent to a Brownian particle hopping in a periodic double-well potential which randomly switches between two profiles. With a nonequilibrium noise, a generalized driving force may be regarded as the sum of two forces: one resulting from energy fluctuations and the other from fluctuations of the spatial dependence of the transition rates. This suggests two mechanisms, energetic and informational, by which the motion occurs. The reciprocating motion results in directed motion if rectified by asymmetric fluctuations of potential barriers. The energy conversion efficiency is calculated and the conditions to maximize it are established.
URI: http://dx.doi.org/10.1021/jp910508t
http://hdl.handle.net/11536/5843
ISSN: 1520-6106
DOI: 10.1021/jp910508t
期刊: JOURNAL OF PHYSICAL CHEMISTRY B
Volume: 114
Issue: 5
起始頁: 1959
結束頁: 1966
顯示於類別:期刊論文


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