Investigation of Micellization and Viscometric Behaviour of Organo-copper Soap-urea Complexes Derived from Various Edible Oils | Bentham Science

摘要

Background: Of-late researches in colloid chemistry are becoming increasinglyimportant in various branches of chemistry, industry, medicine and allied fields. Coppersurfactants derived from various edible oils provide an interesting area of investigation pertainingto its fundamental information regarding their colloid-chemical behaviour. Copper(II) soaps and their urea complexes in polar and non-polar solvents have gained considerablepopularity due to their immense use and widespread applications such as wood preservation,foaming, wetting, biocidal, pesticidal activities, fungicidal, detergency, emulsification,paints, lubrication etc.Objective: Present work has been initiated with a view to obtain a profile due to the natureand structure of copper soap and their urea complexes with long chain fatty acids in polarand non-polar solvent, which have great significance in explaining their characteristics underdifferent conditions. The objective of the present work is study of micellar characterizationsof copper soap and their urea complexes in polar (methanol) and non-polar (benzene)solvents of varying composition and subsequent determinations of CMC using physicalproperties such as, viscosity. This will provide fundamental information regardingtheir colloid chemical behavior.Methods: The density, molar volume, viscosity, specific viscosity, and fluidity of Cu (II)soap- urea complexes derived from various edible oils in a benzene-methanol solvent systemhave been determined at a constant temperature of 303.15 K.Results: The results were used to determine the critical micelle concentration (CMC), soapcomplex-solvent interactions and the effect of chain length of the surfactant molecules onvarious parameters. The values of the CMC in the higher volume percent of methanol arehigher than those of the lower volume percent of methanol. The values of CMC for thesecomplexes are following the order:CSoU>CSeU> CGU > CMUThis shows that there is a decrease in the CMC values with an increase of the average molecularweight of the complex. The conclusions with regard to solute-solute and solutesolventinteractions have been discussed in terms of the well-known Moulik’s and Jones-Dole equations. The effect of surfactant concentration on the viscosity of the solution inthe solvent mixtures has been discussed. The observations suggested that the solvent structurebreaking effect by the solute on the solvent molecules is more prominent above theCMC as compared to below the CMC.Conclusion: The vital information about the micellar behavior of synthesized molecules asa solute and their interactions with different solvents will plays an important role in variousindustrial and biological applications.