Abstract
Systems investigated were C 12H 25N +(CH 2C 6H 5)(CH 3)CH 2COO − (C12BMG)C 12H 25(OC 2H 4) 8OH, C12BMGC 12H 25N +(CH 3) 3Br −, C12BMGC 12H 25SO 3 −Na +(C12SO3Na), and C 10H 21N +(CH 2C 6H 5)(CH 3)CH 2CH 2SO 3 C12SO3Na. Using nonideal solution theory, the molecular interaction parameters for mixed monolayer and mixed micelle formation, β σ and β M , respectively, were determined for these systems. The C12BMG interaction with the second surfactant increased in the order: nonionic < cationic ⪡ anionic. The interaction with the anionic increased with decrease in the pH of the solution. At pH ⪕ 4, a precipitate, C12BMGH + · C12SO3 − appeared. The sulfobetaine showed considerably weaker interaction with C12SO3Na. The C12BMGC12SO3Na system showed synergism in mixed monolayer and mixed micelle formation. Calculated values for the molar ratios of the two surfactants over which synergism should exist in these two respects and for the surface properties of the mixture at its points of maximum synergism agreed well with the experimental values.
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