Abstract
The vesicle formations of 1:1 cationic-anionic surfactants in various nonaqueous polar solvents and their aqueous mixtures were investigated. Outstanding vesicle-forming capability and stability of cationic and anionic surfactants were found in nonaqueous polar solvents and their aqueous mixtures except for in formamide. A small amount of formamide destroys the vesicles formed by cationic-anionic surfactants in aqueous solutions. These results could be very well explained based on the effect of the medium dielectric constant.
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