Adsorption of Cationic Monomeric and Gemini Surfactants on Montmorillonite and Adsolubilization of Vitamin E
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概要
- 論文の詳細を見る
Adsorption of a cationic gemini surfactant (1,2-bis(dodecyldimethylammonio) ethane dibromide, 12-2-12) and the corresponding monomeric surfactant (dodecyltrimethylammonium bromide, DTAB) on montmorillonite has been characterized with a combination of adsorption isotherm, interlayer spacing and FT-IR spectroscopic data. Adsolubilization of vitamin E into the adsorbed surfactant layers has also been studied. The adsorption isotherm data reveal that the adsorption of the two surfactants is driven by the two factors: one is the cation exchange that occurs on the interlayer basal planes and the other is the hydrophobic interaction between hydrocarbon chains of the surfactants. Although the adsorbed amount measured in the saturation region (in mol g-1) is almost identical for the two surfactants, the conformation of the intercalated surfactant molecules differs significantly from each other. The adsorption of DTAB results in a lateral bilayer arrangement in the limited interlayer space, whereas 12-2-12 gives a normal bilayer arrangement in the expanded interlayer space. Adsolubilization of vitamin E takes place into the adsorbed surfactant layers, and interestingly, all the vitamin E molecules added in the montmorillonite suspensions are hybridized at lower surfactant concentrations due to the great specific surface area of the clay material. Since the maximum adsolubilization amount is usually obtained just below the critical micelle concentration, the gemini surfactant is deemed to be more efficient than the corresponding monomeric one to achieve the great adsolubilization amount.
- 日本油化学会の論文
著者
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Sharma Suraj
Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Sci
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Abe Masahiko
Department Of Internal Medicine Hokkaido Prefectural Haboro Hospital
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Sakai Kenichi
Department Of Mathematical And Life Sciences Graduate School Of Science Hiroshima University
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Sakai Hideki
Department Of Nephro-urology Nagasaki University Graduate School Of Biomedical Sciences
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Esumi Kunio
Department Of Applied Chemistry And Institute Of Colloid And Interface Science Science University Of
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Takamatsu Yuichiro
Miyoshi Oil & Fat Co., Ltd.
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Torigoe Kanjiro
Department of Pure and Applied Chemistry in Faculty of Science and Technology and Research Institute
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Nakajima Erimi
Department of Applied Chemistry, Faculty of Science, Tokyo University of Science
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Yoshimura Tomokazu
Graduate School of Humanities and Sciences, Nara Women’s University
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Torigoe Kanjiro
Department Of Applied Chemistry And Institute Of Colloid And Interface Science Science University Of
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Takamatsu Yuichiro
Miyoshi Oil & Fat Co., Ltd.
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Esumi Kunio
Department of Applied Chemistry, Faculty of Science, Tokyo University of Science
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Sharma Suraj
Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
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Torigoe Kanjiro
Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
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Yoshimura Tomokazu
Graduate School of Humanities and Sciences, Nara Women's University
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Sakai Hideki
Department of Industrial Chemistry, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
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