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- W2055768587 abstract "Abstract Interfacial, thermodynamic, and performance properties of aqueous binary mixtures of α‐sulfonato palmitic acid methyl ester, C 14 H 29 CH(SO 3 Na)COOCH 3 (PES), and hexaoxyethylene monododecyl ether, CH 3 (CH 2 ) 11 (OCH 2 CH 2 ) 6 OH (C 12 E 6 ), were investigated with tensiometric, conductometric, fluorimetric, and viscometric techniques. The critical micelle concentration (CMC), maximum surface excess, minimum area per molecule of surfactant at the air/water interface, and the thermodynamics of micellization and adsorption were determined. The CMC was very low for mixed systems, indicating probable use as a detergent with less effect on the environment because of surfactant biodegradability and less amount in the environment. The interaction parameter β m , computed by using the theory of Rubingh and Maeda, indicated an attractive interaction (synergism) between the surfactant molecules, which was also confirmed by proton nuclear magnetic resonance studies in the mixed micelle. The micellar aggregation number ( N agg ), determined by using a steady‐state fluorescence quenching method at a total surfactant concentration of about ∼10 mM at 25°C, was almost independent of the surfactant mixture composition. The micropolarity and the binding constant ( K sv ) for the C 12 E 6 /PES mixed system were determined by the ratio of the intensities ( I 1 / I 3 ) of the pyrene fluorescence emission spectrum, and the local microenvironment inside the micelle was found to be polar. The viscosity of the mixed system at all mole fractions suggested that mixed micelles are nonspherical in nature. The cloud point of oxyethylene group‐containing surfactants was increased by the addition of PES. Foaming was temperature dependent, and a 1∶1 mixed system showed minimum foaming. All performance properties were composition dependent." @default.
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- W2055768587 date "2004-01-01" @default.
- W2055768587 modified "2023-09-29" @default.
- W2055768587 title "α-Sulfonato palmitic acid methyl ester-hexaoxyethylene monododecyl ether mixed surfactant system: Interfacial, thermodynamic, and performance property study" @default.
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- W2055768587 doi "https://doi.org/10.1007/s11743-004-0293-y" @default.
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