Document Type
Article (Restricted)
Publication Date
1-1-2012
Abstract
The surface properties of binary mixtures of anionic sodium methyl ester α-sulfo alkylate (CmMES) and cationic alkyl trimethylammonium bromide (CⁿTAB) of different carbon chain length have been studied in the present work. The critical micelle concentration (CMC) that was obtained from the plots of surface tension (y) versus concentration showed that mixed surfactants have CMC values that were about 10 times lower than their single components.The large negative values for both interaction parameters suggest the existence of strong synergism between the oppositely charged surfactant molecules. The effect of hydrocarbon chain length of either surfactant was also compared and results showed that the effect of cationic surfactant chain length dominated that of the anionic surfactants. It was also discovered that certain mixed surfactant combinations behave differently from the expected trend.
Keywords
Mixed surfactants, Methyl ester sulfonate, Critical micelle concentration, Surface tension, Mixed micelles, Anionic–cationic.
Divisions
CHEMISTRY
Publication Title
Journal of Surfactants and Detergents
Publisher
Springer Verlag