A study of the dynamic interaction of surfactants with graphite and carbon nanotubes using Fmoc-amino acids as a model system

Y.N. Li, B.G. Cousins, R.V. Ulijn, I.A. Kinloch

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We have studied the dynamic interaction of surfactants with carbon surfaces by using a series of Fmoc- (N-(fluorenyl-9-methoxycarbonyl)) terminated amino acid derivatives (Fmoc−X, where X is glycine, tyrosine, phenylalanine, tryptophan, or histidine) as a model system. In these systems, highly conjugated fluorenyl groups and aromatic amino acid side chains interact with the carbon surface, while carboxylate groups provide an overall negative charge. Ideal carbon surfaces were selected which possessed either predominantly macroscale (graphite) or nanoscale features (multiwalled carbon nanotube (MWNT) mats). The adsorption equilibrium for the Fmoc−X solutions with the graphitic surfaces was well-described by the Freundlich model. When a library containing various Fmoc−X compounds were exposed to a target graphite surface, Fmoc−tryptophan was found to bind preferentially at the expense of the other components present, leading to a substantial difference in the observed binding behavior compared to individual adsorption experiments. This approach therefore provides a straightforward means to identify good surfactants within a library of many candidates. Finally, the fully reversible nature of Fmoc−X binding was demonstrated by switching the surface chemistry of carbon substrate through sequential exposure to surfactants with increasing binding energies.
LanguageEnglish
Pages11760-11767
Number of pages7
JournalLangmuir
Volume25
Issue number19
DOIs
Publication statusPublished - 14 Sep 2009

Fingerprint

Carbon Nanotubes
Graphite
Surface-Active Agents
amino acids
Amino acids
Carbon nanotubes
nanotubes
Surface active agents
graphite
carbon nanotubes
surfactants
Amino Acids
Carbon
Tryptophan
carbon
tryptophan
interactions
Adsorption
Aromatic Amino Acids
Multiwalled carbon nanotubes (MWCN)

Keywords

  • carbon surfaces
  • Fmoc-amino acids
  • fluorenyl
  • carboxylate
  • graphitic surfaces
  • binding behavior
  • surfactants

Cite this

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abstract = "We have studied the dynamic interaction of surfactants with carbon surfaces by using a series of Fmoc- (N-(fluorenyl-9-methoxycarbonyl)) terminated amino acid derivatives (Fmoc−X, where X is glycine, tyrosine, phenylalanine, tryptophan, or histidine) as a model system. In these systems, highly conjugated fluorenyl groups and aromatic amino acid side chains interact with the carbon surface, while carboxylate groups provide an overall negative charge. Ideal carbon surfaces were selected which possessed either predominantly macroscale (graphite) or nanoscale features (multiwalled carbon nanotube (MWNT) mats). The adsorption equilibrium for the Fmoc−X solutions with the graphitic surfaces was well-described by the Freundlich model. When a library containing various Fmoc−X compounds were exposed to a target graphite surface, Fmoc−tryptophan was found to bind preferentially at the expense of the other components present, leading to a substantial difference in the observed binding behavior compared to individual adsorption experiments. This approach therefore provides a straightforward means to identify good surfactants within a library of many candidates. Finally, the fully reversible nature of Fmoc−X binding was demonstrated by switching the surface chemistry of carbon substrate through sequential exposure to surfactants with increasing binding energies.",
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A study of the dynamic interaction of surfactants with graphite and carbon nanotubes using Fmoc-amino acids as a model system. / Li, Y.N.; Cousins, B.G.; Ulijn, R.V.; Kinloch, I.A.

In: Langmuir, Vol. 25, No. 19, 14.09.2009, p. 11760-11767.

Research output: Contribution to journalArticle

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