期刊
JOURNAL OF OLEO SCIENCE
卷 58, 期 5, 页码 235-242出版社
JAPAN OIL CHEMISTS SOC
DOI: 10.5650/jos.58.235
关键词
diglycerol monolaurate; cyclohexane; n-octane; small-angle X-ray scattering (SAXS); reverse micelles
资金
- JSPS
Structure of diglycerol monolaurate (abbreviated as C(12)G(2)) 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 C(12)G(2) formed reverse micelle (RM) in cyclohexane and it-octane without addition of water at normal room temperature. A clear signature of one dimensional (I-D) micellar growth was found with increasing C(12)G(2) 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.
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