Dielectric study of methanol-1-hexanol using time domain reflectometry

The complex permittivity spectra of mixtures of methanol with 1-hexanol have been measured in the frequency range 10 MHz to 20 GHz using time domain reflectometry at different temperatures 288 K,298 K,308 K and 318 K respectively. The dielectric parameters such as static dielectric constant, relaxation time were obtained using the calibration method based on nonlinear least squares fit method. Using these parameters excess permittivity, excess inverse relaxation time, were determined. It is observed that, the static permittivity decreases with increase in mole fractions of 1-hexanol in methanol whereas the relaxation time increases for the binary system. The excess inverse relaxation time discussed to yield information on the dynamics and molecular structure of the mixture. The excess permittivity confirms the strong interaction between the molecules of methanol and 1-hexanol in the mixture. The study of excess inverse relaxation time of methanol-1-hexanol reveals dipole rotates slowly in methanol rich region.