DIELECTRIC RELAXATION STUDY OF MIXTURES OF METHANOL AND DIMETHYLAMINOETHANOL USING TIME DOMAIN REFLECTOMETRY

Abstract

Dielectric relaxation measurements on Methanol – Dimethylaminoethanol solvent mixtures have been carried out across the entire concentration range using Time Domain Reflectometry technique at 15, 25, 35 and 45⁰C over the frequency range from 10 MHz to 20 GHz. The mixtures exhibit a principle dispersion of the Davidson-Cole relaxation type at microwave frequencies. The Bilinear calibration method is used to obtain complex permittivity e^*(w) from complex reflection coefficient r^*(w) over the frequency range 10 MHz to 10 GHz. The excess permittivity (e^E), excess inverse relaxation time (1/t)^E, Kirkwood correlation factor (g^eff) and thermodynamic parameters are also calculated to study the Solute-Solvent interaction.