Micelle Formation of Phosphate-Type Hybrid Surfactants in Aqueous Solution

Micelle formation in aqueous solution of novel hybrid surfactants with phosphate head group was investigated. The critical micelle concentrations (CMC) were determined as a function of temperature by surface tension measurements. The results of electrical conductivity measurements were analyzed according to the mixed electrolyte model of the micellar solution to estimate the micellar aggregation number and the degree of counter-ion binding on the micelle. Thermodynamic parameters for the micelle formation were estimated on the basis of these results. Discussion is given on the micelle formation of the present surfactant species comparing with the sulfonate-type hybrid surfactants.