The effects of electrostatic correlations on the ionic current rectification in conical nanopores
The effects of electrostatic correlations on the ionic current rectification in conical nanopores
复制标题
静电关联对圆锥形纳米孔离子电流整流的影响
DOI:
10.1002/elps.201900127
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发表时间:
2019
期刊:
影响因子:
2.9
通讯作者:
Zhao, Hui
中科院分区:
文献类型:
--
作者:
Alidoosti, Elaheh;Zhao, Hui
Ion‐ion electrostatic correlations are recognized to play a significant role in the presence of concentrated multivalent electrolytes. To account for their impact on ionic current rectification phenomenon in conical nanopores, we use the modified continuum Poisson‐Nernst‐Planck (PNP) equations by Bazant et al. Coupled with the Stokes equations, the effects of the EOF are also included. We thoroughly investigate the dependence of the ionic current rectification ratios as a function of the double layer thickness and the electrostatic correlation length. By considering the electrostatic correlations, the modified PNP model successfully captures the ionic current rectification reversal in nanopores filled with lanthanum chloride LaCl3. This finding qualitatively agrees with the experimental observations that cannot be explained by the standard PNP model, suggesting that ion‐ion electrostatic correlations are responsible for this reversal behavior. The modified PNP model not only can be used to explain the experiments, but also go beyond to provide a design tool for nanopore applications involving multivalent electrolytes.
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期刊:
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Langmuir : the ACS journal of surfaces and colloids
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