scholarly journals Dielectric dispersion and thermodynamic behavior of stearic acid binary mixtures with alcohol as co-solvent using time domain reflectometry

2017 ◽  
Vol 07 (04) ◽  
pp. 1750027 ◽  
Author(s):  
M. Maria Sylvester ◽  
T. Ganesh ◽  
D. J. S. Anand Karunakaran ◽  
P. Senthilkumar ◽  
Praveen G. Hudge ◽  
...  
Keyword(s):  
Dielectric Permittivity ◽  
Stearic Acid ◽  
Time Domain ◽  
Dielectric Strength ◽  
Calibration Method ◽  
Time Domain Reflectometry ◽  
Ternary Mixtures ◽  
Relaxation Dynamics ◽  
Dielectric Parameters ◽  
Strength Formula

Dielectric permittivity and relaxation dynamics of binary and ternary mixture of stearic acid on various concentration and their thermodynamic effects are studied. The static dielectric constant ([Formula: see text]), dielectric permittivity ([Formula: see text]) and dielectric loss ([Formula: see text]) are found by bilinear calibration. The relaxation time ([Formula: see text]), dielectric strength ([Formula: see text]) and the excess permittivity ([Formula: see text]) are found. The thermodynamic parameters such as enthalpy ([Formula: see text]), entropy ([Formula: see text]) and Gibb’s free energy ([Formula: see text]) are evolved. The significant changes in dielectric parameters are due to the intramolecular and intermolecular interactions in response to the applied frequency. The permittivity spectra of stearic acid–alcohol in the frequency range of 10[Formula: see text]MHz to 30[Formula: see text]GHz have been measured using picoseconds Time Domain Reflectometry (TDR). The dielectric parameters ([Formula: see text], [Formula: see text], [Formula: see text]) are found by bilinear calibration method. Influence of temperature in intermolecular interaction and the relaxation process are also studied. The FT-IR spectral analysis reveals that the conformation of functional groups and formation for hydrogen bonding are present in both binary and ternary mixtures of stearic acid.

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

2016 ◽  
Vol 46 (3) ◽  
pp. 283-291 ◽  
Author(s):  
Anil A. Sonkamble ◽  
Rahul P. Sonsale ◽  
Mahesh S. Kanshette ◽  
Komal B. Kabara ◽  
Kunal H. Wananje ◽  
...  
Keyword(s):  
Vegetable Oils ◽  
Time Domain ◽  
Thermophysical Properties ◽  
Time Domain Reflectometry ◽  
Relaxation Dynamics

Frequency analysis of time‐domain reflectometry (TDR) with application to dielectric spectroscopy of soil constituents

Geophysics ◽  
1999 ◽  
Vol 64 (3) ◽  
pp. 707-718 ◽  
Author(s):  
Richard Friel ◽  
Dani Or
Keyword(s):  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Frequency Domain ◽  
Time Domain ◽  
Dominant Role ◽  
Primary Objective ◽  
Time Domain Reflectometry ◽  
Complete Picture ◽  
Frequency Dependent ◽  
Additional Information

Standard analyses of time‐domain reflectometry (TDR) waveforms in environmental sciences use traveltime along waveguides and reflection amplitude to infer water content and bulk electrical conductivity, respectively. TDR waveforms contain additional information on the frequency‐dependent dielectric permittivity of media, which can be extracted through transformation of TDR waveforms into the frequency domain. The primary objective of this study was to provide a more complete picture of TDR responses in the frequency domain and to improve estimation of dielectric properties. The frequency content of TDR waveforms interacting with various constituents was measured and compared with predictions based on known dielectric properties and waveguide geometries. The study highlights the dominant role of the S11 scatter function, which describes how a TDR signal is modified by media properties and probe configuration. Scatter functions derived from transformed TDR waveforms into the frequency domain were used for estimation of frequency‐dependent dielectric properties of wet soils. The main results were (1) a more complete picture of TDR waveforms in the frequency domain; (2) estimation and use of scatter functions for TDR‐based dielectric permittivity estimation; and (3) highlights of potential usefulness and limitations of a commonly used TDR cable tester (Tektronix 1502B) and waveguide design for estimation of frequency‐dependent dielectric properties of porous media.

scholarly journals Dielectric spectroscopy and hydrogen bonding studies of 1-chloropropane–ethanol mixture using TDR technique

2019 ◽  
Vol 09 (02) ◽  
pp. 1950018 ◽  
Author(s):  
Ravindra V. Shinde ◽  
Avadhut R. Deshmukh ◽  
Shital A. Ingole ◽  
Ashok C. Kumbharkhane
Keyword(s):  
Relaxation Time ◽  
Dielectric Permittivity ◽  
Correlation Factor ◽  
Time Domain Reflectometry ◽  
Least Square ◽  
Dielectric Parameters ◽  
Structural Formation ◽  
Static Dielectric Permittivity ◽  
Least Square Fit ◽  
The Time Domain

The time-domain reflectometry technique was exercised to assess the complex permittivities of 1-chloropropane and ethanol along with their binary mixture in the frequency range of 10[Formula: see text]MHz–50[Formula: see text]GHz and in the temperature range of 10–[Formula: see text]C. Dielectric parameters like static dielectric permittivity ([Formula: see text] and relaxation time ([Formula: see text] have been acquired by the least-square-fit method. The obtained assessments of static permittivity and relaxation time were used to compute various dielectric parameters like excess dielectric constant, excess relaxation time, Kirkwood correlation factor and thermodynamic parameters. The experimental outcome illustrates the nonlinear variations in dielectric permittivity, relaxation time and authenticates the structural formation due to intermolecular interaction between 1-chloropropane and ethanol. Molecular rotary motion and dipole reorientation movements of these complex systems are presented in agreement with the molar entropy and enthalpy.

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