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. The critical micelle concentration (CMC) and the counter ion binding constant (B) for the mixe dmicellizations of DBS (sodium dodecylbenzenesulfonate) with Brij 30 (polyoxyethylene(4) lauryl ether) and Brij 35 (polyoxyethylene(23) lauryl ehter) at 25 o C in pure water and in aqueous solutions of n-butanol were determined as a function of α 1 (the overall mole fraction of DBS) by the use of electric conductivity method. Various thermodynamic parameters (X i , γ i , C i , a iM , β, and △H mix ) were calculated and compared for each mixed surfactant system by means of the equations derived from the nonideal mixed micellar model. The results show that the molecules of DBS interact more strongly with Brij 35 than Brij 30 and that the DBS/Brij 35 mixed system has greater negative deviation from the ideal mixed micellar model than the DBS/Brij 30 mixed system. Keywords: DBS, Brij 35, Brij 30, Critical micelle concentration, Counter ion binding constant, Non ideal mixe dmicellar model

Comparative Study on the Mixed Micellizations of Anionic Surfactant (DBS) with Nonionic Surfactnats (Brij 30 and Brij 35)