Abstract
The critical micelle concentration (CMC) and the counterion binding constant ( B) in a mixed micellar state of the Dodecylpyridinium chloride (DPC) with the Cetyldimethylethylammonium bromide (CDEAB) at 25 o C in aqueous solutions of n-butanol were determined as a function of α 1 (the overall mole fraction of DPC) by the use of elec- tric conductivity method. Various thermodynamic parameters ( Xi, γi, Ci, ai M , β, and ∆ Hmix) were calculated by means of the equations derived from the nonideal mixed micellar model. The effect of n-butanol on the mixed micellization of the DPC/CDEAB mixtures has been also studied by analyzing the measured and calculated thermodynamic parameters (CMC, B, and ∆ G o m).
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