Programmed Dispersions of MWNTs in Aqueous Media by Coating with Photopolymerizable Synthetic Amphiphiles
- Cédric Thauvin
- ,
- Aurélia Perino
- ,
- Emmanuel Contal
- ,
- Emmanuelle Morin
- ,
- Patrick Schultz
- ,
- Stéphane Meunier
- , and
- Alain Wagner
Abstract

Amphiphiles are known to be suitable molecules to disperse carbon nanotubes (CNTs) in water by shielding their highly hydrophobic surfaces. Herein, we describe tailored anionic, nonionic, and cationic photopolymerizable synthetic amphiphiles that are designed to achieve programmed pH-dependent dispersions of CNTs. The reported process involves (1) the assessment of the amphiphiles’ ability to form micelles in given buffer solutions, (2) the equilibrated self-assembly of the amphiphiles into hemimicellar structures on the hydrophobic surface of the CNTs, (3) the stabilization of these labile supramolecular assemblies by photopolymerization, (4) the purification of the obtained CNTs/photopolymerized lipidic assemblies (PLA) constructs, and (5) the characterization of the CNTs/PLA constructs pH dependant dispersion. In conclusion, we demonstrate that CNTs/PLA constructs with specific pH-dependent dispersion properties can easily be prepared. The constructs appear quite robust because they can withstand several cycles of precipitation and redispersion, and interestingly, they demonstrate the same pH-dependency as the amphiphiles used in the coating process.
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