Abstract
A multiplicity of transitions is observed, when the surface tension of aqueous solutions of nonionic surfactant ( S) in the presence of the dye ( D), C. I. Acid Blue 120, which interacts strongly with nonionic surfactant to form a dye-surfactant complex, is measured at a constant concentration of the dye and plotted as a function of surfactant concentration. Such a characteristic curve reflects on the process of complex formations through the surface adsorption of free surfactant molecules in the solution. Analysis for the process leads to the conclusion that small complexes DS n with n corresponding to 2 or 3, are formed in the region of lower surfactant concentrations, and that large complexes DS l , where l is from about 10 to 30, are formed in the region of higher surfactant concentrations.
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