Ion Concentration Polarization by Bifurcated Current Path

Abstract Ion concentration polarization (ICP) is a fundamental electrokinetic process that occurs near a perm-selective membrane under dc bias. Overall process highly depends on the current transportation mechanisms such as electro-convection, surface conduction and diffusioosmosis and the fundament...

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Autores principales:	Junsuk Kim, Inhee Cho, Hyomin Lee, Sung Jae Kim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/203c21b728cd46f38bd52d83fb277eac
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spelling	oai:doaj.org-article:203c21b728cd46f38bd52d83fb277eac2021-12-02T11:40:14ZIon Concentration Polarization by Bifurcated Current Path10.1038/s41598-017-04646-02045-2322https://doaj.org/article/203c21b728cd46f38bd52d83fb277eac2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04646-0https://doaj.org/toc/2045-2322Abstract Ion concentration polarization (ICP) is a fundamental electrokinetic process that occurs near a perm-selective membrane under dc bias. Overall process highly depends on the current transportation mechanisms such as electro-convection, surface conduction and diffusioosmosis and the fundamental characteristics can be significantly altered by external parameters, once the permselectivity was fixed. In this work, a new ICP device with a bifurcated current path as for the enhancement of the surface conduction was fabricated using a polymeric nanoporous material. It was protruded to the middle of a microchannel, while the material was exactly aligned at the interface between two microchannels in a conventional ICP device. Rigorous experiments revealed out that the propagation of ICP layer was initiated from the different locations of the protruded membrane according to the dominant current path which was determined by a bulk electrolyte concentration. Since the enhancement of surface conduction maintained the stability of ICP process, a strong electrokinetic flow associated with the amplified electric field inside ICP layer was significantly suppressed over the protruded membrane even at condensed limit. As a practical example of utilizing the protruded device, we successfully demonstrated a non-destructive micro/nanofluidic preconcentrator of fragile cellular species (i.e. red blood cells).Junsuk KimInhee ChoHyomin LeeSung Jae KimNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Junsuk Kim Inhee Cho Hyomin Lee Sung Jae Kim Ion Concentration Polarization by Bifurcated Current Path
description	Abstract Ion concentration polarization (ICP) is a fundamental electrokinetic process that occurs near a perm-selective membrane under dc bias. Overall process highly depends on the current transportation mechanisms such as electro-convection, surface conduction and diffusioosmosis and the fundamental characteristics can be significantly altered by external parameters, once the permselectivity was fixed. In this work, a new ICP device with a bifurcated current path as for the enhancement of the surface conduction was fabricated using a polymeric nanoporous material. It was protruded to the middle of a microchannel, while the material was exactly aligned at the interface between two microchannels in a conventional ICP device. Rigorous experiments revealed out that the propagation of ICP layer was initiated from the different locations of the protruded membrane according to the dominant current path which was determined by a bulk electrolyte concentration. Since the enhancement of surface conduction maintained the stability of ICP process, a strong electrokinetic flow associated with the amplified electric field inside ICP layer was significantly suppressed over the protruded membrane even at condensed limit. As a practical example of utilizing the protruded device, we successfully demonstrated a non-destructive micro/nanofluidic preconcentrator of fragile cellular species (i.e. red blood cells).
format	article
author	Junsuk Kim Inhee Cho Hyomin Lee Sung Jae Kim
author_facet	Junsuk Kim Inhee Cho Hyomin Lee Sung Jae Kim
author_sort	Junsuk Kim
title	Ion Concentration Polarization by Bifurcated Current Path
title_short	Ion Concentration Polarization by Bifurcated Current Path
title_full	Ion Concentration Polarization by Bifurcated Current Path
title_fullStr	Ion Concentration Polarization by Bifurcated Current Path
title_full_unstemmed	Ion Concentration Polarization by Bifurcated Current Path
title_sort	ion concentration polarization by bifurcated current path
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/203c21b728cd46f38bd52d83fb277eac
work_keys_str_mv	AT junsukkim ionconcentrationpolarizationbybifurcatedcurrentpath AT inheecho ionconcentrationpolarizationbybifurcatedcurrentpath AT hyominlee ionconcentrationpolarizationbybifurcatedcurrentpath AT sungjaekim ionconcentrationpolarizationbybifurcatedcurrentpath
_version_	1718395628328845312

Ion Concentration Polarization by Bifurcated Current Path

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