DIELECTRIC-RELAXATION OF DIMETHYLSULFOXIDE IN BENZENE AND CARBONTETRACHLORIDE SOLUTIONS FROM MICROWAVE-ABSORPTION STUDIES

Using standard microwave techniques, the dielectric constant-epsilon' and dielectric loss-epsilon" for dilute solutions of Dimethylsulphoxid e (DMSO) in benzene and carbontetrachloride (CCl4) have been measured at 9.174 GHz at different temperatures (25, 30, 35 and 40-degrees-C). Following the single frequency concentration variational method sugges ted by Gopalakrishana, the dielectric relaxation time-tau and dipole m oment-mu at various temperatures have been calculated. Based on above studies, monomer structure for DMSO in both the solutions have been in ferred. The presence of solute-solvent association in both the solutio ns have been proposed. Dielectric relaxation process can be treated as the rate process just like the viscous flow process. Energy parameter s for the dielectric relaxation process have been calculated and compa red with the corresponding energy parameters for the viscous flow.