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We develop two new amphiphilic molecules that are shown to act as efficientsurfactants for carbon nanotubes in non-polar organic solvents. The activeconjugated groups, which are highly attracted to graphene nanotube surface, arebased on pyrene and porphyrin. We show that relatively short (C18) carbon tailsare insufficient to provide stabilization. As our ultimate aim is to disperseand stabilize nanotubes in siloxane matrix (polymer and crosslinked elastomer),both surfactant molecules were made with long siloxane tails to facilitatesolubility and steric stabilization. We show that pyrene-siloxane surfactant isvery effective in dispersing multi-wall nanotubes, while the porphyrin-siloxaneis making single-wall nanotubes soluble, both in petroleum ether and insiloxane matrix.

Polysiloxane surfactants for the dispersion of carbon nanotubes in non-polar organic solvents