The differences in surfactant adsorption on carbon nanotubes and their bundles

Panagiotis Angelikopoulos, Henry Bock

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Dissipative particle dynamics simulations of a mesoscale model are performed to investigate the concentration dependence of surfactant adsorption on small-diameter carbon nanotubes and their bundles. Adsorption is found to follow fundamentally different mechanisms in the two cases because of the heterogeneity of the bundle surface and the difference in diameter of bundles compared to that of individual tubes. Whereas aggregation dominates adsorption on individual tubes, on bundles it is largely a Langmuir-type process. High adsorption energy sites on the outer surface of bundles, where surfactant molecules can interact with two tubes simultaneously, dominate at low coverage. They also cause adsorption on bundles to become significant well before adsorption on individual tubes starts. The difference in the adsorption mechanisms leads to a crossover point at higher concentrations, where the adsorbed amount per surface area on individual tubes becomes larger than that for the bundles. © 2009 American Chemical Society.

Original languageEnglish
Pages (from-to)899-907
Number of pages9
JournalLangmuir
Volume26
Issue number2
DOIs
Publication statusPublished - 19 Jan 2010

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