Self-assembly of phosphate fluorosurfactants in carbon dioxide.
Anionic phosphodiester surfactants, possessing either two fluorinated chains (F/F) or one hydrocarbon chain and one fluorinated chain (H/F), were synthesized and evaluated for solubility and self-assembly in liquid and supercritical carbon dioxide. Several surfactants, of both F/F and H/F types and having varied counterions, were found to be capable of solubilizing water-in-CO2 (W/C), via the formation of microemulsions, expanding upon the family of phosphate fluorosurfactants already found to stabilize W/C microemulsions. Small-angle neutron scatteringwas used to directly characterize the microemulsion particles at varied temperatures, pressures, and water loadings, revealing behavior consistent with previous results on W/C microemulsions.
Keiper
Jason S
JS
NSF Center for Environmentally Responsible Solvents and Processes, Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.
Behles
Jacqueline A
JA
Bucholz
Tracy L
TL
Simhan
Ruma
R
DeSimone
Joseph M
JM
Lynn
Gary W
GW
Wignall
George D
GD
Melnichenko
Yuri B
YB
Frielinghaus
Henrich
H