PMID: 22362144Mar 1, 2012Paper

Phase behavior of phytosterol ethoxylates in an imidazolium-type room-temperature ionic liquid

Journal of Oleo Science
Hideki SakaiMasahiko Abe

Abstract

The temperature-concentration phase behavior of nonionic surfactants in an aprotic imidazolium-type room-temperature ionic liquid (RT-IL) was evaluated on the basis of a combination of visual appearance, polarized optical microscopy, and small angle X-ray scattering data. Phytosterol ethoxylates (BPS-n, where n denotes oxyethylene chain lengths of 5, 10, 20, and 30) were used as surfactants in the RT-IL, 1-butyl-3-methylimidazolium hexafluorophosphate (BmimPF₆). The two component mixtures yielded various phases such as discontinuous cubic, hexagonal, and lamellar phases. An increased tendency toward formation of lesser-curved molecular assemblies was observed at higher BPS-n concentrations, at lower temperatures, and for shorter oxyethylene chain surfactants. These trends are similar to those observed in aqueous BPS-n systems; however, notable differences in the phase states of the aqueous system versus the BmimPF₆ system were evident. Comparison with the water system showed that the BmimPF₆ system yielded fewer phases and generally required higher BPS-n concentrations to induce phase transitions. Evaluation of the effects of addition of a third component (e.g., 1-dodecanol and dodecane) to the binary system on the phase behavi...Continue Reading

References

Apr 7, 1999·Journal of Colloid and Interface Science·B M FolmerW Brown
Dec 16, 2004·Chemical Communications : Chem Comm·Luyan WangZhenwen Sun
Jan 11, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Tamar L GreavesCalum J Drummond
Apr 3, 2007·The Journal of Physical Chemistry. B·Tamar L GreavesCalum J Drummond
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Jul 24, 2008·Chemical Society Reviews·Tamar L Greaves, Calum J Drummond
May 14, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Hideki SakaiMasahiko Abe
Jun 22, 2010·Chemical Reviews·Renhao Dong, Jingcheng Hao
Mar 5, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Kenichi SakaiMasahiko Abe
Oct 27, 2011·Journal of Oleo Science·Hideki SakaiMasahiko Abe

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Citations

Jul 30, 2014·The Journal of Physical Chemistry. B·Haihui Joy JiangGregory G Warr
Oct 22, 2013·The Journal of Physical Chemistry. B·Suraj Chandra SharmaGregory G Warr

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