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http://dx.doi.org/10.12925/jkocs.2014.31.4.612

Study on the Solubilization of 4-Chlorobenzoic Acid by Lauryl Sulfobetaine 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.4, 2014 , pp. 612-622 More about this Journal
Abstract
In this study, we investigated the solubilization 4-chlorobenzoic acid in a wide range of temperature using a zwitterionic surfactant of lauryl sulfobetaine(LSB) and mixed surfactant systems. The effects of temperature and alkyl-group's length of surfactant molecule on the solubilization of 4-chlorobenzoic acid have been measured. The solubilization constants ($K_s$) were taken by the UV/Vis spectrophotometric method, plotting the total absorbance of the solution versus the surfactant concentration. The results show that the values of ${\Delta}G^o_s$ are all negative within the measured temperature range and decrease by increasing temperature, And also the measured values of ${\Delta}H^o_s$ and ${\Delta}S^o_s$ are all positive and increase by increasing temperature. The values of $K_s$ and thermodynamic parameters are simultaneously dependent on the temperature and the kinds of surfactant molecules. From the results we can postulate the solubilization site of 4-chlorobenzoic acid within the micelle.
Keywords
zwitterionic surfactant; 4-chlorobenzoic acid; solubilization constant; absorbance; thermodynamic parameters;
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Times Cited By KSCI : 5  (Citation Analysis)
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