Dielectric Relaxation Study of Binary Mixtures having Shielded Charge Distribution with Exposed Charge Distribution Using Time Domain Reflectometry

摘要

The importance of measuring the dielectric constant of a liquid lies in the fact that it provides valuable information about intermolecular interaction and dynamics of molecules at molecular levels. In Nitrobenzene (NB) and Chlorobenzene (CB) molecules the charge distribution is shielded and H-bonds do not appear where as in 2-Ethoxyethanol (2-EE) molecules the charge distribution is exposed. In pure Nitrobenzene and Chlorobenzene spatial correlation between molecules may appear only by means of dipole-dipole interactions. When there is an exposed distribution of charges, there may be very strong intermolecular interaction, however, in shielded distribution relative contribution to neighbor molecules is absent and hence there may be weak intermolecular interaction between the molecules of the liquids. Here the picoseconds Time domain reflectometry in reflection mode has been used to obtain complex dielectric spectra ε* (ω)= ε' - jε" of binary mixture of 2-EE with NB and CB in the frequency range of 10 MHz to 10 GHz at temperatures of 288, 298, 308 and 318K.