The dielectric relaxation studies for decanol-amine mixtures over the frequency range of 10 MHz – 10 GHz have been carried out using pico-second time domain reflectometry technique. The dielectric quantities like the static dielectric constant (ε_0m) and the dielectric constants at infinite frequency (ε_∞m) were obtained. The relaxation time (τ), the effective Kirkwood correlation factor (g_eff), the excess dielectric parameter such as excess dielectric permittivity (ε^E) and excess inverse relaxation time (1/τ)^E were calculated. The thermodynamic properties (ΔF_τ) of the mixtures of decanol with diethyl amine, n-butylamine, triethylamine, aniline and pyridine were evaluated. The Bruggeman factor shows large variation with volume fraction of aromatic amines. The (g_eff) is almost unity for amines and > 1 for decanol with diethylamine, triethylamine, aniline and pyridine mixtures, showing a parallel orientation of the dipoles. The studies suggest that these amines effectively break the α-clusters of decanol and form specific complexes without any charge transfer. It is observed that the values of the enthalpy of activation (ΔF_τ) for the dielectric relaxation always greater than the theoretically predicted values for all the mixtures studied.

Keywords: Dielectric Relaxation; Time Domain Reflectometry; Decanol-Amine Mixture; Kirkwood Correlation Factor; Thermodynamic Properties;