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http://dx.doi.org/10.12925/jkocs.2021.38.4.994

Study on the Solubilization of 4-Halogenated Anilines by Cationic Surfactants (DTAB, TTAB, and CTAB)  

Lee, Byung-Hwan (Department of Applied Chemical Engineering, Korea University of Tech. & Edu.)
Lee, Dong-Cheol (Department of Applied Chemical Engineering, Korea University of Tech. & Edu.)
Publication Information
Journal of the Korean Applied Science and Technology / v.38, no.4, 2021 , pp. 994-1002 More about this Journal
Abstract
The solubilization constants (Ks) of 4-halogenated aniline derivatives by cationic surfactants (DTAB, TTAB, and CTAB) were measured by the UV-Vis method. As a result, the Ks values decreased as the temperature increased for all the aniline derivatives and showed a tendency to increase as the radius of the halogen substituent and the hydrophobic length of surfactant increased. The calculated values of ΔGo and ΔHo for these solubilizations all showed negative values within the measured range, but all the ΔSo values showed positive values. For all the 4-halogenated anilines, the ΔGo values all tended to decrease as the temperature increased, but both values of ΔHo and ΔSo showed a tendency to increase. In addition, as the radius of the halogen substituent increased, the values of ΔHo and ΔSo tended to decrease in general. However, when the hydrophobic group length of the surfactant was increased, the values of these thermodynamic functions showed a tendency to increase in general, although it differed depending on the type of aniline derivative. From the changes of such functions, it was possible to estimate the type and strength of interactions between 4-halogenated aniline and micelle, and the location at which they were solubilized in the micelle.
Keywords
Cationic surfactant; Critical Micellar Concentration; Solubilization constant; 4-halogenated aniline; thermodynamic function;
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