Suppression of ion conductance by electro-osmotic flow in nano-channels with weakly overlapping electrical double layers

Suppression of ion conductance by electro-osmotic flow in nano-channels with weakly overlapping electrical double layers

This theoretical study investigates the nonlinear ionic current-voltage characteristics of nano-channels that have weakly overlapping electrical double layers. Numerical simulations as well as a 1-D mathematical model are developed to reveal that the electro-osmotic flow (EOF) interplays with the co...

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Main Authors: Yang Liu, Lingzi Guo, Xin Zhu, Qiushi Ran, Robert Dutton
Format: Article
Language:English
Published: AIP Publishing LLC 2016-08-01
Series:AIP Advances
Online Access:http://dx.doi.org/10.1063/1.4962302
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spelling doaj-0c9e41402a814685b0e92ff255d272512020-11-24T22:47:18ZengAIP Publishing LLCAIP Advances2158-32262016-08-0168085022085022-810.1063/1.4962302087608ADVSuppression of ion conductance by electro-osmotic flow in nano-channels with weakly overlapping electrical double layersYang Liu0Lingzi Guo1Xin Zhu2Qiushi Ran3Robert Dutton4College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, ChinaCollege of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, ChinaCollege of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, ChinaDepartment of Electrical Engineering, Stanford University, Stanford, CA USADepartment of Electrical Engineering, Stanford University, Stanford, CA USAThis theoretical study investigates the nonlinear ionic current-voltage characteristics of nano-channels that have weakly overlapping electrical double layers. Numerical simulations as well as a 1-D mathematical model are developed to reveal that the electro-osmotic flow (EOF) interplays with the concentration-polarization process and depletes the ion concentration inside the channels, thus significantly suppressing the channel conductance. The conductance may be restored at high electrical biases in the presence of recirculating vortices within the channels. As a result of the EOF-driven ion depletion, a limiting-conductance behavior is identified, which is intrinsically different from the classical limiting-current behavior.http://dx.doi.org/10.1063/1.4962302
collection DOAJ
language English
format Article
sources DOAJ
author Yang Liu
Lingzi Guo
Xin Zhu
Qiushi Ran
Robert Dutton
spellingShingle Yang Liu
Lingzi Guo
Xin Zhu
Qiushi Ran
Robert Dutton
Suppression of ion conductance by electro-osmotic flow in nano-channels with weakly overlapping electrical double layers
AIP Advances
author_facet Yang Liu
Lingzi Guo
Xin Zhu
Qiushi Ran
Robert Dutton
author_sort Yang Liu
title Suppression of ion conductance by electro-osmotic flow in nano-channels with weakly overlapping electrical double layers
title_short Suppression of ion conductance by electro-osmotic flow in nano-channels with weakly overlapping electrical double layers
title_full Suppression of ion conductance by electro-osmotic flow in nano-channels with weakly overlapping electrical double layers
title_fullStr Suppression of ion conductance by electro-osmotic flow in nano-channels with weakly overlapping electrical double layers
title_full_unstemmed Suppression of ion conductance by electro-osmotic flow in nano-channels with weakly overlapping electrical double layers
title_sort suppression of ion conductance by electro-osmotic flow in nano-channels with weakly overlapping electrical double layers
publisher AIP Publishing LLC
series AIP Advances
issn 2158-3226
publishDate 2016-08-01
description This theoretical study investigates the nonlinear ionic current-voltage characteristics of nano-channels that have weakly overlapping electrical double layers. Numerical simulations as well as a 1-D mathematical model are developed to reveal that the electro-osmotic flow (EOF) interplays with the concentration-polarization process and depletes the ion concentration inside the channels, thus significantly suppressing the channel conductance. The conductance may be restored at high electrical biases in the presence of recirculating vortices within the channels. As a result of the EOF-driven ion depletion, a limiting-conductance behavior is identified, which is intrinsically different from the classical limiting-current behavior.
url http://dx.doi.org/10.1063/1.4962302
work_keys_str_mv AT yangliu suppressionofionconductancebyelectroosmoticflowinnanochannelswithweaklyoverlappingelectricaldoublelayers
AT lingziguo suppressionofionconductancebyelectroosmoticflowinnanochannelswithweaklyoverlappingelectricaldoublelayers
AT xinzhu suppressionofionconductancebyelectroosmoticflowinnanochannelswithweaklyoverlappingelectricaldoublelayers
AT qiushiran suppressionofionconductancebyelectroosmoticflowinnanochannelswithweaklyoverlappingelectricaldoublelayers
AT robertdutton suppressionofionconductancebyelectroosmoticflowinnanochannelswithweaklyoverlappingelectricaldoublelayers
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