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• W2018794695 endingPage "1514" @default.
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• W2018794695 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 XMEGA10 and cmc vs ZMEGA10. From the diagram an azeotrope was found to be formed by the 1:1 mixture (at XMEGA10 = ZMEGA10 = 0.5), suggesting that the composition in micelles (Yi) differs from that in the adsorbed film (Zi). The surface tension (γ) vs logarithmic molality (ln m) curve at every 0.1 increment in XMEGA10 showed synergistically enhanced surface activity. From the slope of the γ vs ln m curve just below cmc, the surface excess (Γ) was determined and then the mean molecular area (Am) was calculated as a function of XMEGA10. By analysis of Am data, the partial molecular area (PMA) of each component was determined as a function of XMEGA10; this also showed a large deviation from ideal mixing (the additivity rule)." @default.
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• W2018794695 date "1999-12-17" @default.
• W2018794695 modified "2023-09-25" @default.
• W2018794695 title "Micellization and Adsorbed Film Formation of a Binary Mixed System of Anionic/Nonionic Surfactants" @default.
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• W2018794695 doi "https://doi.org/10.1021/la990331t" @default.
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