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Title: Confinement-controlled rectification in a geometric nanofluidic diode
Author: Dal Cengio, Sara
Pagonabarraga Mora, Ignacio
Keywords: Nanofluids
Issue Date: 6-Jul-2019
Publisher: American Institute of Physics
Abstract: 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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It is part of: Journal of Chemical Physics, 2019, vol. 151, p. 044707
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ISSN: 0021-9606
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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