Dielectric Relaxation Study of Lipids in the Microwave Frequency Region Using TDR

A.A. Sonkamble¹ , S.M. Dongarge² , M. Malathi³ , U.V. Biradar⁴

Section:Research Paper, Product Type: Journal-Paper
Vol.9 , Issue.5 , pp.16-22, Oct-2021

Online published on Oct 31, 2021

Copyright © A.A. Sonkamble, S.M. Dongarge, M. Malathi, U.V. Biradar . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Dielectric properties of lipids were measured using time domain reflectometry technique in the microwave frequency range at 298.15 K. The dielectric permittivity and dielectric loss parameters have been responded for oleic and linoleic acids between 10 MHz to 1 GHz. The complex permittivity spectra for these lipids were well defined by the Havriliak-Negami equation and fitted in Debye model. Cole-Cole plot shows single relaxation process occurs in the lipids. The different parameters like static dielectric constant, high frequency limiting dielectric constant dielectric relaxation time, Dipole moment and Kirkwood correlation factor have also been determined. Here, the effect of microwave frequencies on dynamical and structural properties of oleic and linoleic acids were discussed through dielectric behavior. This study reports that the magnitude of dielectric constant of lipids increased with increasing molecular chain length and the molecular reorientation of lipids is described by dielectric relaxation time. The intermolecular hydrogen bonding with parallel dipole moments was confirmed by Kirkwood correlation factor. The present investigation could be useful for the characterization of lipids during transportation and energy storage applications.

Key-Words / Index Term :
Lipids, Time Domain Reflectometry (TDR), Dielectric properties, Free energy of activation, Dipole moment, Kirkwood correlation factor

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