Phase behavior of sucrose monoalkanoate in a water-long-chain alcohol system |
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Authors: | H Kunieda N Kanei I Tobita K Kihara A Yuki |
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Institution: | (1) Department of Physical Chemistry Division of Materials Science and Chemical Engineering, Yokohama National University, Tokiwadai 156 Hodogaya-ku, 240 Yokohama, Japan;(2) Department of Application Laboratories Center for Applied Technology, Rigaku Corporation, Matsubara-cho 3-9-12 Akishima, 196 Tokyo, Japan;(3) Specially Chemicals Laboratory Material Science Research Sector Yokohama Research Center, Mitsubishi Chemical Corporation, Kamoshida 1000, Aoba-ku, 227 Yokohama, Japan |
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Abstract: | Phase diagram of a water/sucrose monododecanoate (SE)/hexanol system was determined at 30°C. Aqueous micellar, reverse micellar, normal hexagonal liquid crystalline, and lamellar liquid crystalline phases appear in the phase diagram. The change in interlayer spacing and interfacial section area of surfactant in the liquid crystalline phases was investigated by small-angle x-ray scattering. Upon addition of water, the section area and the radius of cylindrical aggregates are almost constant in a hexagonal liquid crystal, whereas the distance between each cylinder is separated on the water-SE axis. The interlayer spacing slightly decreases or is almost unchanged on the surfactant-hexanol axis, because alcohol molecules penetrate into the palisade of bilayers. Although the average section area decreases with increasing alcohol content, each section area of SE and alcohol molecules are kept constant. Since the interfacial section area of alcohol is less than the section area of hydrocarbon chain, the phase transition from lamellar liquid crystal to reverse micelle occurs in an alcohol-rich region. |
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Keywords: | Sucrose monoalkanoate lamellar liquid crystal small-angle x-ray scattering |
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