期刊
JOURNAL OF CHEMICAL PHYSICS
卷 145, 期 8, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4961505
关键词
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资金
- National Science Foundation [DMR 1404940]
- National Institutes of Health [R01HG002776-11]
- AFOSR [FA9550-14-1-0164]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1404940] Funding Source: National Science Foundation
We report a three dimensional Langevin dynamics simulation of a uniformly charged flexible polyelectrolyte chain, translocating through an asymmetric narrow channel with periodically varying cross sections under the influence of a periodic external electric field. When reflection symmetry of the channel is broken, a rectification effect is observed with a favored direction for the chain translocation. For a given volume of the channel unit and polymer length, the rectification occurs below a threshold frequency of the external periodic driving force. We have also observed that the extent of the rectification varies non-monotonically with increasing molecular weight and the strength of geometric asymmetry of the channel. Observed non-monotonicity of the rectification performance has been interpreted in terms of a competition between two effects arising from the channel asymmetry and change in conformational entropy. An analytical model is presented with predictions consistent with the simulation results. Published by AIP Publishing.
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