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Eur Biophys J. 2017 Apr;46(3):283-291. doi: 10.1007/s00249-016-1165-7. Epub 2016 Sep 7.

Relaxation dynamics and thermophysical properties of vegetable oils using time-domain reflectometry.

Author information

1
School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded, 431 606, Maharashtra, India.
2
Yeshwanth Jr. Collage, Umri Dist, Nanded, 431 606, Maharashtra, India.
3
Shri Shivaji Jr. Collage, Nanded, 431 606, Maharashtra, India.
4
Ramkrishna Paramhans Mahavidhyalaya, Osmanabad, 413 501, Maharashtra, India.
5
School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded, 431 606, Maharashtra, India. avsarode@gmail.com.

Abstract

Dielectric relaxation studies of vegetable oils are important for insights into their hydrogen bonding and intermolecular dynamics. The dielectric relaxation and thermo physical properties of triglycerides present in some vegetable oils have been measured over the frequency range of 10 MHz to 7 GHz in the temperature region 25 to 10 °C using a time-domain reflectometry approach. The frequency and temperature dependence of dielectric constants and dielectric loss factors were determined for coconut, peanut, soya bean, sunflower, palm, and olive oils. The dielectric permittivity spectra for each of the studied vegetable oils are explained using the Debye model with their complex dielectric permittivity analyzed using the Havriliak-Negami equation. The dielectric parameters static permittivity (ε 0), high-frequency limiting static permittivity (ε ), average relaxation time (τ 0), and thermodynamic parameters such as free energy (∆F τ), enthalpy (∆H τ), and entropy of activation (∆S τ) were also measured. Calculation and analysis of these thermodynamic parameters agrees with the determined dielectric parameters, giving insights into the temperature dependence of the molecular dynamics of these systems.

KEYWORDS:

Dielectric relaxation; Thermo-physical parameter; Time-domain reflectometry (TDR); Vegetable oil

PMID:
27604548
DOI:
10.1007/s00249-016-1165-7
[Indexed for MEDLINE]

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