ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 51, Number 2
JKCSEZ 51(2)
April 20, 2007 

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 (ΔG^o_m, ΔH^o_m, and ΔS^o_m) 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 ΔG^o_m are all negative at the whole measured condition but the values of ΔS^o_m and ΔH^o_m are positive or negative, depending on the measured temperature and α1.