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Title

AGGREGATION BEHAVIOR OF CATION-RICH CATANIONIC MIXTURES OF GEMINI SURFACTANTS AND DODECYL SULPHATE SODIUM (SDS)

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Abstract

 PHYSIOCHEMICAL PROPERTIES AND AGGREGATION BEHAVIOR OF CATION-RICH CATANIONIC MIXTURES OF ESTER-CONTAINING CATIONIC GEMINI SURFACTANTS AND DODECYL SULPHATE SODIUM (SDS) WERE INVESTIGATED USING SURFACE TENSION, ELECTRICAL CONDUCTIVITY AND CYCLIC VOLTAMMETRY. DIFFERENT PHYSICOCHEMICAL PROPERTIES SUCH AS THE CRITICAL MICELLE CONCENTRATION (CMC), DEGREE OF COUNTERION DISSOCIATION (ADISS), INTERFACIAL PROPERTIES, SIZE OF AGGREGATES, AND INTERPARTICLE INTERACTION PARAMETERS WERE DETERMINED. THE INTERACTIONS BETWEEN TWO SURFACTANTS WERE ANALYZED ON THE BASIS OF REGULAR SOLUTION THEORY, BOTH FOR MIXED MONOLAYERS AT THE AIR/ LIQUID INTERFACE (B D) AND FOR MIXED MICELLES (BM). THE VALUES OF BM AND BD FOR ALL MIXED SYSTEMS WERE NEGATIVE, WHICH INDICATES THAT AFTER MIXING, THE INTERACTION BETWEEN GEMINIS AND SDS IS MORE ATTRACTIVE OR LESS REPULSIVE COMPARED TO BEFORE MIXING. IT WAS FOUND THAT THE SURFACE ACTIVITY OF MIXED SURFACTANTS IS BETTER THAN THE INDIVIDUAL SURFACTANTS. THE RESULTS SHOWED THAT THE CHEMICAL STRUCTURE OF GEMINI SURFACTANTS HAVE SIGNIFICANT EFFECT ON THE AGGREGATION BEHAVIOR AND THE THERMODYNAMICS OF MICELLIZATION. IT WAS OBSERVED A PHASE TRANSITION WITH CONCENTRATION FOR BOTH MIXED SYSTEMS.

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