title: Characterization of carbon nanotube dispersions in solutions of bile salts and derivatives containing aromatic substituents.
abstract: Bile salts (BS) are known to solubilize high weight fractions of carbon nanotubes (CNTs) in aqueous solutions. Here, the efficiency of derivatives of bile salts (BSDs) containing aromatic substituents in dispersing single-wall CNTs (SWCNTs) has been investigated in order to check whether the presence of aromatic residues, because of their affinity toward carbon nanotube surfaces, determines improvements of the BS dispersion efficiency (DE). Electric arc and CoMoCAT SWCNTs were analyzed. The results, reported for the two surfactant concentrations of 0.06 and 1.0 wt %, show that the DE of BSDs depends on the position, orientation, and structure of the introduced aromatic residues. In the case of the CoMoCAT SWCNTs, at low surfactant concentration a DE improvement is observed in BSDs where the aromatic residue is linked either to carbon 3, located on the rigid four-ring system, or to the side chain. For the latter, this improvement is also enhanced in double-charge derivatives and kept at high surfactant concentration. It was also observed that at low concentrations of surfactant, the DE values of BSs and BSDs are usually larger than those of the more conventional detergent sodium dodecylsulfate.
authors.affiliation: Dipartimento di Chimica, "Sapienza" Università di Roma , P. le A. Moro 5, 00185 Roma, Italy.
authors.forename: Marta
authors.initials: M
authors.lastname: Gubitosi
authors.forename: Juan V
authors.initials: JV
authors.lastname: Trillo
authors.forename: Ariel
authors.initials: A
authors.lastname: Alfaro Vargas
authors.forename: Nicolae Viorel
authors.initials: NV
authors.lastname: Pavel
authors.forename: Delia
authors.initials: D
authors.lastname: Gazzoli
authors.forename: Simona
authors.initials: S
authors.lastname: Sennato
authors.forename: Aida
authors.initials: A
authors.lastname: Jover
authors.forename: Francisco
authors.initials: F
authors.lastname: Meijide
authors.forename: Luciano
authors.initials: L
authors.lastname: Galantini
mesh_terms: D001647:Bile Acids and Salts / Q000737:chemistry*; D006841:Hydrocarbons, Aromatic / Q000737:chemistry*; D015394:Molecular Structure; D037742:Nanotubes, Carbon / Q000737:chemistry*; D012996:Solutions
chemical_list: D001647:Bile Acids and Salts; D006841:Hydrocarbons, Aromatic; D037742:Nanotubes, Carbon; D012996:Solutions