Abstract
Mixtures of nonionic gemini surfactant S-10 (α, α'-[2,4,7,9-tetrametyl-5-decyne-4,7-diyl]bis[Ͽ-hydroxy-polioxyetylene]) with anionic SRS (sodium alkylsulfates) and SRSO3 (sodium alkylsulfonates) of different alkyl chain length (from 10 to 14 carbon atoms) were investigated. Surface tension measurements were used to find the cmc values and other adsorption parameters. The Clint, Rubingh⿿s and Rosen theories were applied for evaluation of the synergistic effects in mixed films and mixed micelles formation. It has been documented that in the process of micellization strong synergy exists, while in mixed film formation it is not so evident. In mixtures of S-10 with monomeric surfactants, the synergistic interactions in mixed micelles formation increase with the chain length of monomeric surfactant. The composition of mixed films is different than the composition of mixed micelles, because molar fraction of S-10 in monolayers is much higher than its contribution in mixed micelles at the same bulk composition. The size of micelles is the biggest for S-10 and in case of surfactants mixtures is smaller than that, for individual components.
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