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Journal of Dispersion Science and Technology Volume 23, 2002 - Issue 1-3
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Original Articles

Formation of Microemulsions in Aqueous NaCl/Sodium (3-Dodecanoyloxy-2-Hydroxy-Propyl) Succinate/Glycerol Mono(2-Ethylhexyl) Ether/Oil Systems

Jin-Feng Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai 79-7, Hodogaya-ku, Yokohama, 240-8501, Japan
,
Kenji Aramaki Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai 79-7, Hodogaya-ku, Yokohama, 240-8501, Japan
,
Akihiro Ogawa Mitsubishi Chemical Corporation Research and Development Division, Yokohama Research Center, Kamosida-cho 1000, Aoba-ku, Yokohama, 227-8502, Japan
,
Masahiko Tsukahara NIKKO CHEMICALS Co., Ltd. Cosmos, Research and Development, 3-24-3 Hasune, Itabashi-ku, Tokyo, 174-0046, Japan
&
Hironobu Kunieda Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai 79-7, Hodogaya-ku, Yokohama, 240-8501, Japan
Pages 29-36 | Received 15 Jul 2001, Accepted 15 Sep 2001, Published online: 12 Feb 2010
 
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ABSTRACT

Sodium (3-dodecanoyloxy-2-hydroxy-propyl) succinate (SLGMS) forms microemulsions by mixing with cosurfactants such as glycerol mono(2-ethylhexyl) ether (MEH), although the combination with ordinary cosurfactant such as hexanol does not form a microemulsion of large solubilization. The middle-phase microemulsion coexists with excess water and oil (octane) phases at an optimum-mixing fraction of SLGMS and MEH in the presence of salt. The monomeric solubility of MEH in oil is low and MEH is mainly combined with SLGMS at an oil—water interface inside microemulsions. With decreasing salinity, the three-phase body shrinks and eventually disappears. The three-phase body may be terminated at a tricritical point, at which three phases simultaneously coexist. The effect of type of oil on the solubilization capacity of the microemulsions is also discussed.

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