Adsorption Properties for Aqueous Solution of Binary Mixture of Cocamidopropyl betaine- Sodiumdodecyl sulfate Surfactants on Air-Liquid Interface

The Critical micelle concentration (CMC) of aqueous solution  of Zwitterion surfactant Cocamidopropyl betaine (CAPB),anionic surfactants  sodium dodecyl sulfate (SDS) and their binary mixture solutions have been determined by tensiometer techniques at temperature 298 K .The interfacial parameters Γ max , A min , Π cmc , , pC20 and ΔGᵒ ads for the induvidail and the binary mixture systems were calculated . The deviation from the ideal of the mixed micelles has been discussed on the basis of Clint theory. The results of the mixed systems were analyzed in the light of the regular solution theory (Rubingh) and Rosen’s theory to evaluate the composition of the mixed micelle and the activity coefficient. The negative values of interaction parameters (β m ) for mixed micelle formation indicate the attractive interaction for certain systems.