Dielectric Dispersion Study of Aqueous Solutions

A dielectric measurement for the aqueous solutions at lower frequencies (20Hz to 2MHz) has been carried out in frequency domain using Agilient Precision LCR meter (E4980A). The dielectric permittivity spectra of over entire concentrations with aqueous solutions are measured at 25 ̊C. From observed spectra, static dielectric constants (ε0) have been determined. Dielectric Spectroscopy is especially sensitive to intermolecular interactions. Therefore some parameters like Excess dielectric constant (ε0E) and Kirkwood correlation factor (geff) have been calculated from static dielectric constants of the mixture constituents. Using these parameters hetero molecular interaction, ordering of the like and unlike molecules and the effective dipole moments of the aqueous solutions has been discussed. The maxima of ε0E at particular concentrations of binary mixtures suggest the formation of stable complex structure. Key Words— Precision LCR meter, Static dielectric constant, Excess dielectric constant, Kirkwood correlation factor. _________________________________________________________________________________________________________________