title: Carbon dioxide-in-water microemulsions.
abstract: Liquid and supercritical carbon dioxide swell potassium carboxylate perfluoropolyether (PFPE-K) cylindrical micelles in water to produce novel CO(2)-in-water (C/W) microemulsions. The swelling elongates the micelles significantly from 20 to 80 nm as the molar ratio of CO(2) in the micelles to surfactant (R(CO2)) reaches approximately 8. As the micelles swell to form microemulsions, the solubility of pyrene increases by a factor of ca. 10. Fluorescence spectra suggest that pyrene resides primarily in the low-polarity micelle core rather than in the palisade region. The results illustrate the ability of C/W microemulsions to solubilize both lipophilic and fluorophilic substances simultaneously.
authors.affiliation: Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: C Ted
authors.initials: CT
authors.lastname: Lee
authors.forename: Won
authors.initials: W
authors.lastname: Ryoo
authors.forename: P Griffin
authors.initials: PG
authors.lastname: Smith
authors.forename: Jose
authors.initials: J
authors.lastname: Arellano
authors.forename: Daniel R
authors.initials: DR
authors.lastname: Mitchell
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Lagow
authors.forename: Stephen E
authors.initials: SE
authors.lastname: Webber
authors.forename: Keith P
authors.initials: KP
authors.lastname: Johnston