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» Articles » PMID: 17678369

Concentration Polarization and Nonlinear Electrokinetic Flow Near a Nanofluidic Channel

Overview
Journal Phys Rev Lett
Publisher American Physical Society
Specialty Biophysics
Date 2007 Aug 7
PMID 17678369
Citations 82
Authors
Sung Jae Kim
Ying-Chih Wang
Jeong Hoon Lee
Hongchul Jang
Jongyoon Han
Affiliations
Soon will be listed here.
Abstract

A perm-selective nanochannel could initiate concentration polarization near the nanochannel, significantly decreasing (increasing) the ion concentration in the anodic (cathodic) end of the nanochannel. Such strong concentration polarization can be induced even at moderate buffer concentrations because of local ion depletion (therefore thicker local Debye layer) near the nanochannel. In addition, fast fluid vortices were generated at the anodic side of the nanochannel due to the nonequilibrium electro-osmotic flow (EOF), which was at least approximately 10x faster than predicted from any equilibrium EOF. This result corroborates the relation among induced EOF, concentration polarization, and limiting-current behavior.

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