Destabilization of Surfactant-Dispersed Carbon Nanotubes by Anions

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dc.citation.articleNumber81
dc.citation.journalTitleNanoscale Research Letters
dc.citation.volumeNumber12
dc.contributor.authorHirano, Atsushi
dc.contributor.authorGao, Weilu
dc.contributor.authorHe, Xiaowei
dc.contributor.authorKono, Junichiro
dc.date.accessioned2017-02-08T16:34:32Z
dc.date.available2017-02-08T16:34:32Z
dc.date.issued2017
dc.description.abstractThe colloidal stability of surfactant-dispersed single-wall carbon nanotubes (SWCNTs) is determined by microscopic physicochemical processes, such as association, partitioning, and adsorption propensities. These processes can be controlled by the addition of solutes. While the effects of cations on the colloidal stability of SWCNTs are relatively well understood, little is known about the effects of anions. In this study, we examined the effects of anions on the stability of SWCNTs dispersed by sodium dodecyl sulfate (SDS) using sodium salts, such as NaCl and NaSCN. We observed that the intensity of the radial breathing mode Raman peaks rapidly decreased as the salts were added, even at concentrations less than 25 mM, indicating the association of SWCNTs. The effect was stronger with NaSCN than NaCl. We propose that the association of SWCNTs was caused by thermodynamic destabilization of SDS assemblies on SWCNT surfaces by these salts, which was confirmed through SWCNT separation experiments using aqueous two-phase extraction and gel chromatography. These results demonstrate that neutral salts can be used to control the colloidal stability of surfactant-dispersed SWCNTs.
dc.identifier.citationHirano, Atsushi, Gao, Weilu, He, Xiaowei, et al.. "Destabilization of Surfactant-Dispersed Carbon Nanotubes by Anions." <i>Nanoscale Research Letters,</i> 12, (2017) Springer: http://dx.doi.org/10.1186/s11671-017-1850-1.
dc.identifier.doihttp://dx.doi.org/10.1186/s11671-017-1850-1
dc.identifier.urihttps://hdl.handle.net/1911/93856
dc.language.isoeng
dc.publisherSpringer
dc.rightsThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subject.keywordcarbon nanotube
dc.subject.keywordcolloidal stability
dc.subject.keywordseparation
dc.subject.keywordsurfactant
dc.subject.keywordanion
dc.titleDestabilization of Surfactant-Dispersed Carbon Nanotubes by Anions
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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