Dielectric spectroscopic study of solutions of amino silicone oil in the polar solvent mixtures of methyl ethyl ketone and methyl iso butyl ketone

Abstract

The complex permittivity, complex modulus, alternating current electrical conductivity and complex impedance of the ternary mixtures of amino silicone oil in methyl ethyl ketone and methyl iso butyl ketone have been investigated at 303.15 K temperature over the frequency regime 200 Hz to 2 MHz. Complex permittivity and complex impedance data have been fitted to the Coelho model and Nyquist plot respectively. The Coelho model of complex permittivity data provides the electrode polarization relaxation time related to electric double layer relaxation processes. Nyquist plot of complex impedance data exhibits Debye type dispersion corresponding to conduction relaxation processes and electric double layer relaxation processes. Electrode polarization relaxation time (τEP), relaxation time (τEP′), ionic conductivity relaxation time (τσ), geometric relaxation time (τg) and double layer relaxation time (τdl) have been calculated using the different formalism. Static permittivity (ε0), DC conductivity (σdc) and refractive index (nD) have also been determined for all the ternary mixtures. Solvent effect interaction in amino silicone oil with methyl ethyl ketone, methyl iso butyl ketone and with their mixtures is also discussed in the paper. Systematic variation is observed in all the parameters with change in concentration of amino silicone oil in methyl ethyl ketone and methyl iso butyl ketone.