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Multi-vortical flow inducing electrokinetic instability in ion concentration polarization layer

Title
Multi-vortical flow inducing electrokinetic instability in ion concentration polarization layer
Author
곽노균
Keywords
CONDUCTIVITY GRADIENTS; FUEL-CELLS; PRECONCENTRATION; MICROCHANNEL; MEMBRANES; ENRICHMENT; JUNCTION; CHANNEL
Issue Date
2012-09
Publisher
Royal Society of Chemistry
Citation
Nanoscale, 2012, 4(23), P.7406-7410
Abstract
In this work, we investigated multiple vortical flows inside the ion concentration polarization (ICP) layer that forms due to a coupling of applied electric fields and the semipermeable nanoporous junction between microchannels. While only a primary vortex near perm-selective membrane is traditionally known to lead to electrokinetic instability, multiple vortexes induced by the primary vortex were found to play a major role in the electrokinetic instability. The existence of multiple vortexes was directly confirmed by experiments using particle tracers and interdigitated electrodes were used to measure the local concentration profile inside the ICP layer. At larger applied electric fields, we observed aperiodic fluid motion due to electrokinetic instabilities which develop from a coupling of applied electric fields and electrical conductivity gradients induced by the ICP. The electrokinetic instability at micro-nanofluidic interfaces is important in the development of various electro-chemical-mechanical applications such as fuel cells, bio-analytical preconcentration methods, water purification/desalination and the fundamental study of ion electromigration through nanochannels and nonporous perm-selective membranes.
URI
http://pubs.rsc.org/en/Content/ArticleLanding/2012/NR/c2nr32467a#!divAbstracthttp://hdl.handle.net/20.500.11754/49176
ISSN
2040-3364; 2040-3372
DOI
10.1039/c2nr32467a
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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