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Electrokinetic ion transport in confined micro‐nanochannel
Author(s) -
Wang Junyao,
Liu Chong,
Xu Zheng
Publication year - 2016
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.201500225
Subject(s) - electrokinetic phenomena , ion , charge density , poisson's equation , drop (telecommunication) , mechanics , surface charge , ion transporter , voltage drop , chemistry , materials science , analytical chemistry (journal) , chemical physics , nanotechnology , thermodynamics , current (fluid) , physics , chromatography , telecommunications , organic chemistry , quantum mechanics , computer science
In this paper, a confined micronanochannel is presented to concentrate ions in a restricted zone. A general model exploiting the Poisson–Nernst–Plank equations coupled with the Navier–Stokes equation is employed to simulate the electrokinetic ion transport. The influences of the micronanochannel dimension and the surface charge density on the potential distribution, the ion concentration, and the fluid flow are investigated. The numerical results show that the potential drop depends mainly on the nanochannel, instead of the confined channel. Both decreasing the width and increasing the length enhance the ion enrichment performance. For a given nanochannel, ultimate value of ion concentration may be determined by the potential at the center point of the nanochannel. The study also shows that the enrichment stability can be improved by increasing the micronanochannel width, decreasing the micronanochannel length and reducing the surface charge density.