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http://dx.doi.org/10.12925/jkocs.2014.31.2.244

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

Lee, Nam-Min (Department of Applied Chemical Engineering, Korea University of Tech. & Education)
Lee, Byung-Hwan (Department of Applied Chemical Engineering, Korea University of Tech. & Education)
Publication Information
Journal of the Korean Applied Science and Technology / v.31, no.2, 2014 , pp. 244-254 More about this Journal
Abstract
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 ${\Delta}G^o_s$ are all negative within the measured temperature range and that the values of ${\Delta}H^o_s$ and ${\Delta}S^o_s$ 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.
Keywords
Mixed Surfactant Systems; Solubilization Constant; 4-Chlorobenzoic Acid; Critical Micelle Concentration; Isostructural Temperature;
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Times Cited By KSCI : 3  (Citation Analysis)
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