title: Stable dispersions of silver nanoparticles in carbon dioxide with fluorine-free ligands.
abstract: Iso-stearic acid, a short, stubby compound with branched, methylated tails has been shown to have high solubility in carbon dioxide. Tail solvation by carbon dioxide makes iso-stearic acid a good choice for use as a ligand to sterically stabilize metallic nanoparticles. Iso-stearic acid coated silver nanoparticles have been stably dispersed in carbon dioxide with hexane cosolvent. Neat carbon dioxide has successfully dispersed iso-stearic acid coated silver nanoparticles that had been deposited on either quartz or polystyrene surfaces. These results are the first reports of sterically stabilized nanoparticles in carbon dioxide without the use of any fluorinated compounds.
authors.affiliation: Department of Chemical Engineering, 230 Ross Hall, Auburn University, Alabama 36849, USA.
authors.forename: Philip W
authors.initials: PW
authors.lastname: Bell
authors.forename: Madhu
authors.initials: M
authors.lastname: Anand
authors.forename: Xin
authors.initials: X
authors.lastname: Fan
authors.forename: Robert M
authors.initials: RM
authors.lastname: Enick
authors.forename: Christopher B
authors.initials: CB
authors.lastname: Roberts