Microwave dielectric characterization of binary mixture of formamide with N, N-dimethylaminoethanol

Abstract

Dielectric relaxation measurements of formamide (FMD)-N,N-dimethylaminoethanol (DMAE) solvent mixtures have been carried out over the entire concentration range using time domain reflectometry technique at 25, 35 and 45°C in the frequency range of 10 MHz to 20 GHz. The mixtures exhibit a principle dispersion of the Davidson-Cole relaxation type at microwave frequencies. Bilinear calibration method is used to obtain complex permittivity ɛ*(ω) from complex reflection coefficient ρ*(ω) over the frequency range of 10 MHz to 10 GHz. The excess permittivity (ɛE), excess inverse relaxation time (1/τ)E, Kirkwood correlation factor (geff), activation energy and Bruggeman factor (fB) are also calculated to study the solute-solvent interaction.