Hydration of the organized molecular assembly of ionic surfactants as studied by vapor pressure and x-ray diffraction |
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Authors: | K. Fukada Y. Matsuzaka Y. Ito T. Nakazato K. Matsui Y. Hosoi M. Fujii T. Kato T. Shirakawa T. Seimiya |
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Affiliation: | (1) Department of Chemistry, Faculty of Science, Tokyo Metropolitan University, Minamioosawa 1-1, Hachiohji, 192-03 Tokyo, Japan |
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Abstract: | Equilibrium vapor pressure of water was measured for ionic surfactant-water binary systems as a function of water content over the temperature range 5–11°C. The measurement of x-ray powder diffraction has also been performed to characterize the microscopic structures of these two-component systems. Examined surfactants were the homologs of sodium alkyl sulfate and alkyltrimethylammonium bromide. It was found that dodecyl and decyl sulfate formed solid di-and trihydrate respectively, while octyl sulfate and the cationic surfactants formed lyotropic liquid crystal instead. The x-ray long spacing of the liquid crystals scarcely varied with water content.Enthalpy of vaporization was calculated for both solid hydrates and lyotropic liquid crystals. |
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Keywords: | Surfactant-water binary system solid hydrate lyotropic liquid crystal vapor pressure x-ray diffraction |
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