Structural Investigation of Diglycerol Monolaurate Reverse Micelles in Nonpolar Oils Cyclohexane and Octane
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概要
- 論文の詳細を見る
Structure of diglycerol monolaurate (abbreviated as C12G2) micelles in nonpolar oils cyclohexane and n-octane as a function of compositions, temperatures, and surfactant chain length has been investigated by small-angle X-ray scattering (SAXS). The SAXS data were evaluated by the generalized indirect Fourier transformation (GIFT) method and real-space structural information of particles was achieved. Conventional poly(oxyethylene) type nonionic surfactants do not form reverse micelles in oils unless a trace water is added. However, present surfactant C12G2 formed reverse micelle (RM) in cyclohexane and n-octane without addition of water at normal room temperature. A clear signature of one dimensional (1-D) micellar growth was found with increasing C12G2 concentration. On the other hand, increasing temperature or hydrocarbon chain length of surfactant shorten the length of RM, which is essentially a cylinder-to-sphere type transition in the aggregate structure. Drastic changes in the structure of RM, namely, transition of ellipsoidal prolate to long rod-like micelles was observed upon changing oil from cyclohexane to octane. All the microstructural transitions were explained in terms of critical packing parameter.
- 日本油化学会の論文
著者
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Aramaki Kenji
Graduate School Of Environment And Information Sciences Yokohama National Univ.
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Aramaki Kenji
Graduate School Of Environment And Information Science Yokohama National University
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Shrestha Lok
Graduate School of Environment and Information Sciences, Yokohama National University
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