Characterization and stability of catanionic vesicles formed by pseudo-tetraalkyl surfactant mixtures
- C. Pucci
- L. Perez
- C. La Mesa
- R. Pons
DOIAbstract
The phase behavior of an ad hoc synthesized surfactant, sodium 8-hexadecylsulfate (8-SHS), and its mixtures with didecyldimethylammonium bromide (DiDAB) in water is reported. We dealt with dilute concentration regimes, at a total surfactant content of <30 mmol/kg where vesicular aggregates may be formed. The high synergistic behavior of such catanionic mixtures is concomitant with strongly negative interaction parameters, b (z18 kBT), significant gain in the free energy of association, DGagg, and much lower association concentration compared to the pure surfactants. Vesicle size and zpotential depend on the mixture composition. Hydrodynamic diameters increase by progressive addition of oppositely charged surfactants to the one in excess. Co...
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