Dispersing individual single-wall carbon nanotubes in aqueous surfactant solutions below the cmc

Panagiotis Angelikopoulos, Andrei Gromov, Ailsa Leen, Oleg Nerushev, Henry Bock, E. E B Campbell

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)

Abstract

Dispersions of single-wall carbon nanotubes (SWCNTs) in surfactant solutions below the critical micelle concentration (cmc) have been studied theoretically and experimentally. Dissipative particle dynamics (DPD) simulations of a coarse-grained model predict that surfactant adsorption on small diameter tubes is dominated by aggregation of the surfactant molecules into adsorbed micelles at C ˜ 0.3Ccmc. We also find that the surfactant adsorption is nearly complete at a concentration of around C ˜ 0.5Ccmc. Further increase of the surfactant concentration has only minor effects on the radial density of surfactant headgroups, indicating that SWCNT may be fully stabilized in solutions below the cmc. SWCNT dispersions in solutions of anionic surfactants sodium dodecyl sulfate (SDS) and sodium dodecylbenzenesulfonate (SDBS) below the cmc show a significant fraction of dispersed individual tubes and small bundles, in agreement with the model calculations. © 2010 American Chemical Society.

Original languageEnglish
Pages (from-to)2-9
Number of pages8
JournalJournal of Physical Chemistry C
Volume114
Issue number1
DOIs
Publication statusPublished - 14 Jan 2010

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