Abstract
The influence of the water concentration in the water—n-octane—sodium dodecyl sulfate—n-pentanol microemulsions on the polarity index I 1/I 3, the efficiency of formation of the fluorescent probe (pyrene) excimers I ex/I m, and the conductivity of the system in a wide interval of water—oil ratios was studied. Analysis of changes in the polarity index shows that in all types of the microemulsions pyrene is solubilized in the hydrophobic part of the water—oil interface between the surfactant hydrocarbon radicals. Depending on the water—oil ratio, the site of its localization changes, and the effective permittivity of the medium εeff varies from 5 to 11. Variations of the conductivity and polarity index allow one to observe three structures in the mucroemulsion, viz., water—oil, bicontinual region, and oil—water. Variation of the I ex/I m ratio reveals only the transition from the water—oil microemulsion to the oil—water microemulsion.
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Shtykov, S.N., Mel"nikov, G.V. & Shtykova, L.S. Fluorimetric and conductometric study of water—n-octane—sodium dodecyl sulfate—n-pentanol microemulsions. Russian Chemical Bulletin 52, 398–402 (2003). https://doi.org/10.1023/A:1023467018018
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DOI: https://doi.org/10.1023/A:1023467018018