纳米孔
离子
离子运输机
材料科学
纳米技术
化学物理
化学
有机化学
作者
Yechan Noh,N. R. Aluru
出处
期刊:ACS Nano
[American Chemical Society]
日期:2020-07-28
卷期号:14 (8): 10518-10526
被引量:36
标识
DOI:10.1021/acsnano.0c04453
摘要
Ionic transport through a charged nanopore at low ion concentration is governed by the surface conductance. Several experiments have reported various power-law relations between the surface conductance and ion concentration, i.e., Gsurf ∝ c0α. However, the physical origin of the varying exponent, α, is not yet clearly understood. By performing extensive coarse-grained Molecular Dynamics simulations for various pore diameters, lengths, and surface charge densities, we observe varying power-law exponents even with a constant surface charge and show that α depends on how electrically "perfect" the nanopore is. Specifically, when the net charge of the solution in the pore is insufficient to ensure electroneutrality, the pore is electrically "imperfect" and such nanopores can exhibit varying α depending on the degree of "imperfectness". We present an ionic conductance theory for electrically "imperfect" nanopores that not only explains the various power-law relationships but also describes most of the experimental data available in the literature.
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