Dielectric relaxation study of aqueous glycol ethers with water using time domain reflectometry technique in the frequency range 10 MHz to 50 GHz

Abstract

The Complex permittivity spectra of glycol ether (GE) compounds such as ethylene glycol mono-methyl ether (EGME), ethylene glycol ethyl ether (EGEE) and ethylene glycol butyl ether (EGBE) with water mixture over entire concentration range and at 25 °C has been determined using Time Domain Reflectometry technique in the frequency range 10 MHz to 50 GHz. The complex permittivity spectra for GE–water were fitted in Cole–Davidson model. The Static dielectric constant (ε₀), Relaxation time (τ), effective Kirkwood correlation factor (g^eff), excess permittivity (${\epsilon }_0^E$) and Bruggeman factor (f_B) have been calculated by non-linear least square fit method. The intermolecular interactions between GE-water binary mixtures suggest the non-linear behavior of dielectric parameters. The contribution of hydrogen bonding interactions among the solute-solvent mixtures is confirmed by Excess properties and Bruggeman factor.

Keywords:

• Ethylene glycol mono-methyl ether
• ethylene glycol ethyl ether
• ethylene glycol butyl ether
• complex permittivity
• Kirkwood correlation factor
• excess dielectric properties
• Bruggeman factor

Acknowledgment

This work was supported by the Department of Science and Technology, New Delhi (Project no. DST PROJECTSB/S2/LOP-032/2013) as well as School of Physical Sciences, SRTM University, Nanded, India for providing necessary facilities.