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Cholic acid covalently bound to multi-walled carbon nanotubes: Improvements on dispersion stability

: Redondo-Gomez, C.; Orozco, F.; Michael Noeske, P.-L.; Soto-Tellini, V.; Corrales-Ure~na, Y.R.; Vega-Baudrit, J.


Materials chemistry and physics 200 (2017), pp.331-341
ISSN: 0254-0584
Journal Article
Fraunhofer IFAM ()

Despite the vast volume of literature regarding the interaction between carbon nanotubes and surfactants, the effect of the covalent attachment of an amphiphilic surfactant based on a biomimetic approach to multiwalled carbon nanotubes (MWCNT) has not been explored. In this report, the functionalization of the MWCNT surface with cholic acid by a chemical route is described. A three-step MWCNT chemical modification route was carried out and the properties of the intermediate and final materials were evaluated employing X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM),atomic force microscopy (AFM) and zeta potential measurements. After functionalization, the MWCNT showed a facial bio-amphiphilic behavior; improving the dispersion stability as compared to commercial and oxidized MWCNT. The resulting material preserved the pristine multi-walled structure and originated surprisingly stable dispersions in aqueous and organic polar and low-polarity solvents.