Aqueous solution properties of a silicone surfactant and its mixed surfactant systems |
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Authors: | Makoto Ohno Kunio Esumi Kenjiro Meguro |
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Affiliation: | (1) Department of Applied Chemistry and Institute of Colloid and Interface Science, Science University of Tokyo, Kagurazaka, Shinjuku-ku, 162 Tokyo, Japan |
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Abstract: | The aqueous solution properties of a nonionic silicone surfactant of dimethylpolysiloxane and its mixed surfactant systems
were studied. It was found that the silicone surfactant has a high surface activity and forms micelles in two steps: premicelles
in dilute concentrations and polymolecular micelles above 3.7 × 10−7 mol dm−3.
In mixed systems of the silicone surfactant with anionic hydrocarbon or fluorocarbon surfactant, weak intermicellar interactions
were found. They are due to electrostatic interaction between hydrophilic groups of the respective micelles. Dye solubilization
measurements showed that the solubilized amount of Yellow-OB is greater than predicted by ideal systems. Hydrazo-azo tautomerism
is observed in fluorocarbon-silicone surfactant systems, while Yellow-OB is solubilized only in the azo-form in the hydrocarbon-silicone
surfactant system. |
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Keywords: | Fluorocarbon-silicone surfactant system fluorocarbon surfactant hydrazo-azo tautomerism hydrocarbon-silicone surfactant system hydrocarbon surfactant polymolecular micelles premicelles silicone surfactant |
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