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Evidence of selective cation transport through sub-2 nm single-walled carbon nanotubes

Published online by Cambridge University Press:  10 May 2016

Khadija Yazda ,
Saïd Tahir ,
Thierry Michel ,
François Henn  and
Vincent Jourdain
Khadija Yazda
Affiliation:
Laboratoire Charles Coulomb UMR 5221, CNRS-Université de Montpellier, F-34095, France
Saïd Tahir
Affiliation:
Laboratoire Charles Coulomb UMR 5221, CNRS-Université de Montpellier, F-34095, France
Thierry Michel
Affiliation:
Laboratoire Charles Coulomb UMR 5221, CNRS-Université de Montpellier, F-34095, France
François Henn
Affiliation:
Laboratoire Charles Coulomb UMR 5221, CNRS-Université de Montpellier, F-34095, France
Vincent Jourdain*
Affiliation:
Laboratoire Charles Coulomb UMR 5221, CNRS-Université de Montpellier, F-34095, France
*
*Contact: vincent.jourdain@umontpellier.fr
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Abstract

The electrophoretic transport of ions through single walled carbon nanotubes (SWCNTs) of diameters between 1.2 and 1.8 nm was studied for different monovalent chloride salts using microfluidic devices incorporating either a single or few SWCNTs in parallel. The ionic conductance was found to be about one order of magnitude higher than would be expected from simple bulk electrophoresis without any surface effect. Importantly, the ionic conductance measured for different cations did not scale with their bulk electrophoretic mobility thus indicating a selective cation transport through these sub-2 nm SWCNTs. The transport of Na+ was notably found to be favored in comparison to that of Li+, K+ and Cs+. These results highlight the influence of steric and surface effects induced by the nano-confinement on the transport of ions through sub-2 nm SWCNTs.

Keywords

nanostructurefluidicsC
Type
Articles
Information
MRS Advances , Volume 1 , Issue 28: Nanotechnology , 2016 , pp. 2079 - 2084
Copyright
Copyright © Materials Research Society 2016 

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