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Study on the Solubilization of 4-Chlorobenzoic Acid by Aqueous Solutions of Various Cationic, Nonionic, and Mixed Surfactant Systems

: The interactions of 4-chlorobenzoic acid with the micellar system of various cationic, nonionic, and mixed surfactant systems were studied by the UV/Vis spectrophotometric method. The solubilization constants (K s ) of 4-chlorobenzoic acid into those micellar systems have been measured at various temperatures and various thermodynamic parameters for the solubilization of 4-chlorobenzoic acid have been calculated and analyzed from those changes. The results show that the values of △G os are all negative within the measured temperature range and that the values of △H os and △S os are all positive. The effects of alkyl-group's length of surfactant molecules on the solubilization of 4-chlorobenzoic acid have been also measured. The values of K s were dependent simultaneously on the alkyl-group's length and the kind of head-group in surfactant molecules. From these changes we can postulate the solubilization site and the degree of interaction of 4-chlorobenzoic acid with the micellar systems.