The Effect of the Pressure on the Micellization of the Surfactant in Aqueous Urea Solutions
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概要
- 論文の詳細を見る
The critical micelle concentrations (CMC) of dodecyltrimethylammonium bromide (DTAB) in aqueous urea solutions have been determined over a range of pressures up to 2500 atm at 25 and 35 °C. The partial molal volumes of DTAB in micellar (\bar<I>V</I><SUB>m</SUB>) and singly-dispersed states (\bar<I>V</I><SUB>s</SUB>) have also been determined in aqueous urea solutions at 25 °C. \bar<I>V</I><SUB>s</SUB> increases with the addition of urea, while \bar<I>V</I><SUB>m</SUB> remains approximately constant. The partial molal entropy change of micellization (<I>Δ</I>\bar<I>S</I><SUB>m</SUB>) in water increases with an increase in the pressure up to about 1500 atm, while <I>Δ</I>\bar<I>S</I><SUB>m</SUB> in 3-m urea solution remains virtually unaltered in the low-pressure region. The results suggest that the "iceberg" structure of water around the hydrocarbon chain of the monomeric surfactant is effectively broken down by urea.
- 公益社団法人 日本化学会の論文
著者
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Matuura Ryohei
Department of Chemistry Faculty of Science Kyushu University
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Matuura Ryohei
Department of Chemistry, Faculty of Science, Kyushu University
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Kuramoto Seiji
Department of Chemistry, Faculty of Science, Fukuoka University
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Kaneshina Shoji
College of General Education, Kyushu University
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Tanaka Mitsuru
Department of Applied Chemistry, Faculty of Engineering, Tokushima University
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