Microwave dielectric spectra and molecular interaction in a binary mixture of ethanolamine with diethanolamine

• Published in: Journal of molecular liquids 2013-12, Vol.188, p.1-4
• Main Authors: Patil, A.V., Pawar, V.P.
• Format: Article
• Language: English
• Subjects: Diethanolamine; Ethanolamine; Microwave dielectric spectra; Time domain spectroscopy
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2013.09.007

Microwave dielectric spectra for binary mixtures of ethanolamine with diethanolamine have been determined over the frequency range of 10MHz to 20GHz, at different temperatures, using a time domain spectroscopy (TDS) method at 11 concentrations. The values of the dielectric loss (ε″) have been plotted against the dielectric constant (ε′) in the complex plane. The static dielectric constant (ε0), dielectric constant at high frequency (ε∞), and relaxation time (τ) have been determined using the Debye model, a single relaxation process. The dielectric behavior indicates a change of phase from a semi-solid to a liquid state. The effects of molecular size and number of OH group molecules on H-bond molecular interactions from Kirkwood correlation factors are presented. Complex plane plot of dielectric loss (ε″) vs. dielectric constant (ε′) for various concentrations of DEA in ETA and T=278K. [Display omitted] •Time domain spectroscopy is a powerful tool for the determination of complex permittivity spectra.•The complex permittivity spectra was determined over the frequency range of 10MHz to 20GHz.•The complex plane plot has been determined for the ETA–DEA binary mixture in the system.•Dielectric properties have been determined at different temperatures and concentrations.•The dielectric behavior indicates the change of phase from a semi-solid to a liquid state.