Ultrasonic Studies of Cu(II) Soaps Derived from Mustard and Soya Bean Oils

Ultrasonic velocities have been measured in ternary mixtures containing copper soaps derived from mustard and soya bean in 20% and 40% methanol-benzene mixture to access the effect of polarity of solvent on the micellar features of surfactant. The studies suggest that predomination of benzene (higher percentage of non-polar solvent) play a significant role in compacting the molecular organization of the micelles. From these values, the specific acoustic impedance Z, adiabatic compressibility βad, intermolecular free length Lf, apparent molar compressibility ϕk, molar sound velocity R, primary solvation number Sn have been calculated. The data clearly indicate that the values of u, Z, Sn and R increase whereas the values of βad and Lf decrease consistently with increase of the soap concentration. The critical micelle concentration CMC has also been determined and it has been found that CMC is dependent on the composition of the solvent mixture and composition of the edible oil. The Masson equation has also been applied. The results have been explained on the basis of intermolecular interactions between solvent and solute.

Thermogravimetric Analysis of Copper(II) soaps Derived from Azadirecta indica (Neem) and Pongamia pinnata (Karanj) Non-Edible Oils

Copper(II) soaps derived from Neem (CN) and Pongamia (CP) non-edible oils have been thermally analyzed using TGA technique to determine their energy of activation. IR and NMR spectroscopic studies have been also done earlier. The copper soaps derived from these oils show a single step thermal degradation corresponding to saturated, monounsaturated and polyunsaturated fatty acid components of the non-edible oils. Various equations like Coats-Redfern, Horowitz-Metzger, Broido equations were applied to evaluate the energy of activation. The values of activation energy are observed to be in the following order for all these soaps: CN > CP. CP is observed to be more stable than CN due to its higher activation energy.