Abstract
Micelle formation in water and adsorbed film formation at the air/water interface were investigated by surface tension measurement of a mixed surfactant system: the combination of sodium salt of α-sulfonatomyristic acid methyl ester (α-SMy·Me) with decanoyl-N-methylglucamide (MEGA-10). α-SMy·Me and MEGA-10 can form well-mixed micelles with the aid of a strong interaction between headgroups, and accordingly the critical micelle concentration (cmc) as a function of mole fraction of MEGA-10 in the surfactant mixture (XMEGA10) deviates negatively from ideal mixing. The micellar phase curve (cmc−YMEGA10 relation) was simulated by using the interaction parameter ωR = −2.1; the curve indicated the existence of an azeotrope formed by a 3:2 mixture (at XMEGA10 = YMEGA10 = 0.4). Further, we derived equations related to the composition in the adsorbed film (Zi) equilibrated with monomers in bulk solution and to the interaction parameter (WA), and then constructed a phase diagram including two relations of cmc vs XM...
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