Study of Dielectric Properties of Binary Mixtures of n-Octanol and N,N-Dimethylformamide in Lower Microwave Radiation

The complex permittivity spectra of binary mixtures (0.0 -> 1.0) of n-octanol and N,N-dimethylformamide (DMF) were obtained in the lower microwave radiation region using a vector network analyzer (VNA) at 293.15 K The complex permittivity spectra of n-octanol with DMF and binary mixtures were fitted in a dielectric relaxation model (Havriliak-Negami) to obtain the static dielectric constant (epsilon(0)) and relaxation time (tau). Complex nonlinear least-squares (CNLS) fitting was used to fit the complex dielectric spectra. The nonlinear variation in epsilon(0) and tau against DMF concentration in binary mixtures of n-octanol + DMF indicated hetero-molecular interaction between participating molecular species. The variation in the dielectric constant and dielectric loss against concentration is discussed in light of their dependence on frequency. The microwave radiation heating parameters including power reflected (p(r)), power transmitted (p(t)), and penetration depth (d(p)) were investigated at general purpose and commercial microwave radiation of 2.45 GHz, respectively.