Effective and efficient surfactant for CO 2 having only short fluorocarbon chains

Masanobu Sagisaka*, Shuho Iwama, Atsushi Yoshizawa, Azmi Mohamed, Stephen Cummings, Julian Eastoe

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

26 Citations (Scopus)

Abstract

A previous study (Langmuir2011, 27, 5772) found the fluorinated double-tail sulfogulutarate 8FG(EO) 2 to act as a superefficient solubilizer for water in supercritical CO 2 (W/CO 2) microemulsions. To explore more economic CO 2-philic surfactants with high solubilizing power as well as rapid solubilization rates, the effects of fluorocarbon chain length and linking group were examined with sodium 1,5-bis(1H,1H,2H,2H- perfluoroalkyloxy)-1,5-dioxopentane-2-sulfonates (nFG(EO) 2, fluorocarbon chain length n = 4, 6, 8) and sodium 1,4-bis(1H,1H,2H,2H- perfluoroalkyloxy)-1,4-dioxobutane-2-sulfonate (nFS(EO) 2, n = 4, 8). Visual observation and UV-vis spectral measurements with methyl orange as a reporter dye indicated a maximum water-to-surfactant molar ratio (W 0) in the microemulsions, which was 60-80 for nFG(EO) 2 and 40-50 for nFG(EO) 2. Although it is normally expected that high solubilizing power requires long fluorocarbon surfactant chains, the shortest fluorocarbon 4FG(EO) 2 interestingly achieved the highest W 0 (80) transparent single-phase W/CO 2 microemulsion. In addition, a very rapid solubilization of loaded water into CO 2 was observed for 4FG(EO) 2 even at a high W 0 of ∼80.

Original languageEnglish
Pages (from-to)10988-10996
Number of pages9
JournalLangmuir
Volume28
Issue number30
DOIs
Publication statusPublished - 31 Jul 2012

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