scholarly journals Complex permittivity spectra of binary polar liquids using time domain reflectometry

2018 ◽  
Vol 08 (03) ◽  
pp. 1850019 ◽  
Author(s):  
Shagufta Tabassum ◽  
V. P. Pawar
Keyword(s):  
Binary Mixture ◽  
Time Domain ◽  
Liquid Mixture ◽  
Frequency Dispersion ◽  
Time Domain Reflectometry ◽  
Frequency Range ◽  
Polar Liquids ◽  
Entropy Formula ◽  
Electric Dipoles ◽  
Loss Formula

The study of complex properties in a binary mixture of polar liquids has been carried out in the frequency range of 10[Formula: see text]MHz to 30 GHz at 293[Formula: see text]K and 298[Formula: see text]K temperatures using time domain reflectometry. The complex properties of polar liquids in binary mixture give information about the frequency dispersion in the dielectric permittivity ([Formula: see text]) and dielectric loss ([Formula: see text]). The information regarding the orientation of electric dipoles in a polar liquid mixture is given by Kirkwood parameters. The Bruggeman parameters are used as the indicator of liquid1 and liquid2 interaction. Molar entropy ([Formula: see text]) and molar enthalpy ([Formula: see text]) are also discussed at the end of the paper.

scholarly journals Complex and thermodynamic properties of polar liquids using time domain reflectometry

2018 ◽  
Vol 08 (05) ◽  
pp. 1850032
Author(s):  
Shagufta Tabassum ◽  
V. P. Pawar
Keyword(s):  
Relaxation Time ◽  
Thermodynamic Properties ◽  
Binary Mixture ◽  
Molecular Interactions ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Dielectric Relaxation Time ◽  
Frequency Range ◽  
Polar Liquids ◽  
Bruggeman Parameter

The study of complex properties in a binary mixture of 1,2-dichloroethane (DE) and [Formula: see text]-methylformamide (NMF) polar liquids has been carried out in the frequency range of 10[Formula: see text]MHz to 30[Formula: see text]GHz for 11 different concentrations using time domain reflectometry technique at 283, 288, 293 and 298[Formula: see text]K temperatures. Complex property of binary liquids indicates the type of distribution of the dielectric relaxation time. The Bruggeman parameter gives the information about molecular interactions within binary polar liquids. Thermodynamic parameter deals with the passing of a dipole across a potential barrier which separates the minima of energy.

scholarly journals Dielectric relaxation study of aqueous ethylene glycol mono-methyl ether (EGME) with water using time domain reflectometry technique in the frequency range 10MHz to 50GHz

2020 ◽  
Vol 10 (03) ◽  
pp. 2050004
Author(s):  
Zamir S. Khan ◽  
M. P. Lokhande ◽  
Avadhut Deshmukh ◽  
A. C. Kumbharkhane
Keyword(s):  
Ethylene Glycol ◽  
Methyl Ether ◽  
Time Domain ◽  
Complex Permittivity ◽  
Time Domain Reflectometry ◽  
Excess Properties ◽  
Solvent Mixtures ◽  
Water Mixture ◽  
Frequency Range ◽  
Bruggeman Factor

The Complex permittivity spectra of glycol ether (GE) compounds such as ethylene glycol mono-methyl ether (EGME) with water mixture over entire concentration range and in temperature range of 10–25∘C have been determined using Time Domain Reflectometry (TDR) technique in the frequency range 10[Formula: see text]MHz to 50[Formula: see text]GHz. The complex permittivity spectra for EGME-water were fitted in the Cole–Davidson model. The Static dielectric constant ([Formula: see text], Relaxation time ([Formula: see text], effective Kirkwood correlation factor ([Formula: see text], excess permittivity ([Formula: see text], thermodynamic parameters (activation enthalpy and activation entropy) and Bruggeman factor ([Formula: see text] have been calculated by the nonlinear least square fit method. The intermolecular interactions between EGME-water binary mixtures suggest the nonlinear behavior of dielectric parameters. The contribution of hydrogen bonding interactions among the solute–solvent mixtures is confirmed by Excess properties and Bruggeman factor.

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