Structures of Langmuir-Gibbs Films Consisting of Long-Chain Fatty Acid and Water-Soluble Surfactants
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- Oka Kenichiro
- Department of Materials Science and Technology, Faculty of Industrial Science, Tokyo University of Science
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- Shibata Hirobumi
- Department of Life and Environmental Sciences, Chiba Institute of Technology
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- Watanabe Satoshi
- Department of Materials Science and Technology, Faculty of Industrial Science, Tokyo University of Science
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- Sakai Kenichi
- Research Institute for Science and Technology, Tokyo University of Science
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- Abe Masahiko
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
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- Matsumoto Mutsuyoshi
- Department of Materials Science and Technology, Faculty of Industrial Science, Tokyo University of Science
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The structures of Langmuir-Gibbs (LG) films at the air-solution interface were studied using surface tensiometry, Brewster angle microscopy (BAM), and infrared external reflection spectroscopy (IR-ERS). The LG films were fabricated by forming Langmuir films of deuterated arachidic acid (D19A) and then injecting a water-soluble surfactant, sodium dodecyl sulfate or octaethylene glycol monododecyl ether, into the subphase. The presence of the LG films at the air-solution interface affected the surface tension of water. BAM observations revealed the formation of phase-separated monolayers consisting of D19A monolayers and expanded monolayers of water-soluble surfactant at low concentrations of the water-soluble surfactant. The presence of phase-separated structures was supported by the IR-ERS results. At high concentrations, the water-soluble surfactants adsorbed to the domains of D19A monolayers, forming bilayers under the monolayers. The IR-ERS results suggest the penetration of the water-soluble surfactants into the domains of D19A monolayers and the diffusion of D19A molecules into the bilayer regions of the water-soluble surfactants. At concentrations greater than the critical aggregate concentration and/or critical micelle concentration, D19A molecules were solubilized in the solution. In some cases, the multilayers were kinetically stabilized and were present even 24 h after the injection of the water-soluble surfactants into the subphase.
収録刊行物
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- Journal of Oleo Science
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Journal of Oleo Science 62 (9), 681-693, 2013
公益社団法人 日本油化学会
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詳細情報 詳細情報について
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- CRID
- 1390001204092331392
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- NII論文ID
- 130004436088
- 40019750227
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- NII書誌ID
- AA11503337
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- COI
- 1:STN:280:DC%2BC3sblsVymuw%3D%3D
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- ISSN
- 13473352
- 13458957
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- NDL書誌ID
- 024774224
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- PubMed
- 24005013
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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