Dielectric relaxation study of amides with alcohol mixtures by time domain reflectometry

Using Time Domain Reflectometry (TDR), dielectric relaxation studies have been carried out on binary mixtures of amides (N-methylacetamide, N,N-dimethylacetamide) with alcohol (1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol and 1-decanol) for various concentrations over the frequency range from 10 MHz to 10 GHz at 303 K. The Kirkwood correlation factor and excess dielectric constant properties were determined and discussed to yield information on the molecular interactions of the systems. The relaxation time is varies with the chain length of alcohols and substituted amides are observed. The Bruggeman plot shows a deviation from linearity. This deviation was attributed to some sort of molecular interaction which might place between the alcohols and substituted amides. The excess static permittivity and excess inverse relaxation time values vary from negative to positive for all the systems indicating the solute-solvent interaction to exist between alcohol and substituted amides for all the dynamics of the mixture. Keywords: Dielectric constant, Excess parameters, Kirkwood correlation factor, Relaxation time, Time domain reflectometry