Keywords: Cu(II) surfactant; sesame oil; soyabean oil; soap- solvent interaction; CMC; viscosity

Abstract

The viscosity, specific viscosity, and fluidity of complexes of Cu (II) surfactant derived from sesame and soyabean oils (fresh untreated and treated) in non-aqueous solvent were determined at constant temperature 303.15 K to study the micellar features and critical micelle concentration (CMC). The results were used to determine the CMC, soap complex-solvent interactions and the effect of chain length of the surfactant molecule on various parameters. The conclusions concerning solute-solute and solute-solvent interaction were discussed regarding well-known Moulik’s and Jones-Dole equations. The effect of surfactant concentration on viscosity of the solution in the non-polar solvent was also discussed. The observations suggested that the structure breaking effect by the solute on the solvent molecules was more prominent above CMC as compared to below CMC after the formation of the micelles.