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KMID : 1059520120560020188
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Journal of the Korean Chemical Society
2012 Volume.56 No. 2 p.188 ~ p.194
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Solubilization of 4-Alkylbenzoic Acid Isomers by the Aqueous Solution of Tetradecyltrimethylammonium Bromide
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Lee Nam-Min
Lee Byung-Hwan
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Abstract
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The interaction of 4-alkylbenzoic acid isomers with the micellar system of TTAB (tetradecyltrimethylammonium bromide) was studied by the UV/Vis spectrophotometric method. The solubilization constants (Ks) of 4-alkylbenzoic acid isomers into the TTAB micellar system and the critical micelle concentration (CMC) of TTAB have been measured with the change of temperature. Various thermodynamic parameters have been calculated and analyzed from those measurements. The results show that the values of ?Go s for the solubilization of all the isomers are negative and the values of ?Ho
s and ?So s are all positive within the measured temperature range. The effects of additives (n-butanol and NaCl) on the solubilization of 4-alkylbenzoic acid isomers have been also measured. There was a great change on the values of Ks and CMC simultaneously with these additives. From these changes we can postulate that the solubilization sites of 4-alkylbenzoic acids are the core or deep palisade region of the TTAB micelle.
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KEYWORD
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TTAB, Solubilization constant, 4-Alkylbenzoic acid, Critical micelle concentration, Isostructural temperature
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