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KMID : 1059520070510020129
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Journal of the Korean Chemical Society
2007 Volume.51 No. 2 p.129 ~ p.135
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Thermodynamic Study on the Micellar Properties of TTAB/Brij 35 Mixed Surfactant Systems
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Gil Han-Nae
Lee Byung-Hwan
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Abstract
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The critical micelle concentrations (CMC) and the counter ion binding constants (B) in a micellar state of the mixed surfactant systems of Tetradecyltrimethylammonium bromide (TTAB) with Polyoxyethylene(23) lauryl ether (Brij 35) in water were determined as a function of α1 (the overall mole fraction of TTAB) by the use of electric conductivity method and surface tensiometer method from 15 oC to 35 oC. Values of thermodynamic parameters (ΔGom, ΔHom, and ΔSom) for the micellization of TTAB/Brij 35 mixtures were calculated and analyzed from the temperature dependence of CMC values. The results say that the measured values of ΔGom are all negative at the whole measured condition but the values of ΔSom and ΔHom are positive or negative, depending on the measured temperature and α1.
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KEYWORD
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Mixed Surfactant System, TTAB, Brij 35, Critical Micelle Concentration, Counter Ion Binding Constant, Iso-Structural Temperature
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