Evidence of selective cation transport through sub-2 nm single-walled carbon nanotubes Auteur(s): Yazda K., Tahir S., Michel T., Henn F., Jourdain V. (Article) Publié: Mrs Advances, vol. 1 p.2079-2084 (2016) Ref HAL: hal-01928862_v1 DOI: 10.1557/adv.2016.323 WoS: WOS:000412635300009 Exporter : BibTex | endNote Résumé: The electrophoretic transport of ions through single wall 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 a few CNTs in parallel. The ionic conductance was found to be about one order of magnitude higher than expected from a simple electro-migration behavior without any surface effect. Importantly, the ionic conductance measured for different cations did not scale with their bulk electrophoretic mobility thus indicating a probable 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+ and Cs+ or K+ . 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. |