Physicochemical properties of anionic-nonionic surfactant mixture : α-sulfonatomyristic acid methyl ester (MES) - nonaoxyethylene monododecyl ether (C12E9)

Department of Chemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara-390 002, India E-mail : rakshitak@indiatimes.com akrakshit@yahoo.co. in Manuscript received 20 September 2002 We report the interfacial, thermodynamic and performance properties of the binary mixture of α-sulfonatomyristic acid methyl ester (MES) and nonaoxyethylene monododecyl ether (C12 E9). The critical micelle concentration (cmc), thermodynamics of micellization and adsorption, and minimum area occupied by the surfactant at the air/water interface, micellar aggregation number (Nagg.) have been determined. The mixed micellar composition and interaction parameter (βm) are also evaluated. The estimated interaction parameter indicates an overall attractive interaction in the mixed micelles. Moreover, the performance properties of pure and mixed surfactant systems like foaming and viscosity are also studie