Water/supercritical CO2 microemulsions with mixed surfactant systems

Langmuir : the ACS Journal of Surfaces and Colloids
Masanobu SagisakaKatsuto Otake

Abstract

Phase behavior was investigated for water/supercritical CO 2 (W/scCO2) microemulsions stabilized with sodium bis(1H,1H,2H,2H-heptadecafluorodecyl)-2-sulfosuccinate (8FS(EO) 2) mixed with various guest surfactants. Only for the mixtures with fluorocarbon-hydrocarbon hybrid anionic surfactants (FC6-HC n), the maximum water-to-surfactant molar ratio (W0(c)) was larger than that estimated from linear interpolation of the W0(c) values for pure 8FS(EO) 2 and pure guest surfactant. Fourier transform infrared (FT-IR) measurement for the microemulsion revealed that the mixing of 8FS(EO) 2 with FC6-HC n can prevent a phase transition from the microemulsion to the liquid crystal even in the presence of excess water. It was also found from the measurement of water/scCO 2 interfacial tension that the area occupied per surfactant molecule was markedly increased by the mixing with FC6-HC n. The loose molecular packing, probably due to a microsegregation of 8FS(EO) 2 and FC6-HC n, is consistent with the enhanced stability of the microemulsion upon surfactant mixing.

References

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Feb 21, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Masanobu SagisakaKatsuto Otake
Jul 5, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Timothy G LeongDavid H Gracias
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Citations

Jul 13, 2013·Journal of Chemical Information and Modeling·Erik E SantisoBernhardt L Trout
Oct 15, 2011·Physical Chemistry Chemical Physics : PCCP·Michael KlostermannThomas Sottmann
Dec 25, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Craig JamesJulian Eastoe
Jun 29, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Masanobu SagisakaJulian Eastoe
May 25, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Masanobu SagisakaJulian Eastoe
Jan 26, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Ci YanJulian Eastoe
Mar 30, 2017·The Journal of Physical Chemistry. B·Jin HanHiroshi Umakoshi
May 29, 2018·Physical Chemistry Chemical Physics : PCCP·Muhan WangJun Zhang
Sep 24, 2014·Beilstein Journal of Organic Chemistry·Jocelyn Peach, Julian Eastoe
Jun 14, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Masanobu SagisakaJulian Eastoe
Apr 14, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Masanobu SagisakaJulian Eastoe
Feb 12, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Masanobu SagisakaMarijana Blesic

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