期刊
JOURNAL OF CHEMICAL PHYSICS
卷 151, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5108723
关键词
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资金
- MINECO [FIS2015-67837-P]
- Generalitat de Catalunya [2017SGR-884]
- SNF [20021-175719]
- European Union's Horizon 2020 research and innovation program under ETN [674979-NANOTRANS]
Recent experiments with electrolytes driven through conical nanopores give evidence of strong rectified current response. In such devices, the asymmetry in the confinement is responsible for the non-Ohmic response, suggesting that the interplay of entropic and enthalpic forces plays a major role. Here, we propose a theoretical model to shed light on the physical mechanism underlying ionic current rectification. By use of an effective description of the ionic dynamics, we explore the system's response in different electrostatic regimes. We show that the rectification efficiency, as well as the channel selectivity, is driven by the surface-to-bulk conductivity ratio Dukhin length rather than the electrical double layer overlap.
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