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 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.

Dielectric relaxation of butyl acrylate—alcohol mixtures using time domain reflectometry

2007 ◽  
Vol 61 (4) ◽  
Author(s):  
K. Dharmalingam ◽  
K. Ramachandran ◽  
P. Sivagurunathan ◽  
B. Prabhakar Undre ◽  
P. Khirade ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Dielectric Relaxation ◽  
Time Domain ◽  
Butyl Acrylate ◽  
Correlation Factor ◽  
Time Domain Reflectometry ◽  
Dielectric Relaxation Time ◽  
Inverse Relaxation Time ◽  
Alcohol Mixtures ◽  
Excess Inverse Relaxation Time

AbstractDielectric relaxation measurements of butyl acrylate—alcohol mixtures at different concentrations and temperatures within the frequency range of 10 MHz to 10 GHz have been carried out using time domain reflectometry. Parameters such as the static permittivity, dielectric relaxation time, the Kirkwood correlation factor, the excess inverse relaxation time, and thermodynamic functions were determined and discussed to yield information on the molecular structure and dynamics of the mixture. The value of the dielectric properties decreases with increasing butyl acrylate concentration in alcohol and systematically varies with the length of alcohol alkyl chain. Negative values of the excess inverse relaxation time found for all concentrations and at all temperatures studied may indicate that the effective dipoles rotate slowly.

scholarly journals An Empirical Relation for the Evaluation of the Dielectric Relaxation Time of Certain Polar Liquids Using a Single Microwave Frequency

1974 ◽  
Vol 27 (1) ◽  
pp. 87 ◽  
Author(s):  
BS Sarma ◽  
V Venkateswara Rao
Keyword(s):  
Experimental Data ◽  
Relaxation Time ◽  
Dielectric Relaxation ◽  
Concentration Factor ◽  
Empirical Relation ◽  
Microwave Frequency ◽  
Dielectric Constants ◽  
Dielectric Relaxation Time ◽  
Polar Liquids

An empirical relation is proposed for the determination of the dielectric relaxation time .. of polar liquids with nearly spherical molecules from measurements of the dielectric constants at a single microwave frequency. The relation is obtained by introducing a concentration factor as a parameter in the expression for .. derived by Eyring et al. (1941). Its validity for suitable polar liquids is demonstrated by comparison of results with previously reported values. Thermodynamic parameters for a number of liquids at various concentrations have also been evaluated from experimental data using the relation.

scholarly journals Dielectric Relaxation Studies Between Brompheniramine with 1-Butanol, 1-Pentanol and 1-Hexanol at 303K

2020 ◽  
Vol 17 (3) ◽  
pp. 230-235
Author(s):  
Sampandam Elangovan ◽  
Tilahun Diriba Garbi ◽  
Senbeto Kena Etana
Keyword(s):  
Dielectric Constant ◽  
Relaxation Time ◽  
Dielectric Relaxation ◽  
Intermolecular Interaction ◽  
Research Work ◽  
Liquid Mixtures ◽  
Time Domain Reflectometry ◽  
Dielectric Relaxation Time ◽  
Pharmaceutical Industries ◽  
Relaxation Studies

The dielectric relaxation studies are vital in analyzing the strength of the inter molecular interaction between the binary liquid systems [1-4]. Jyostna et al. [5] reported thermodynamic parameters of isoamyl alcohols and mono clinic aromatic liquid mixtures. Shakila et al. [6] studied the dielectric properties of aromatic alcohols and aliphatic amines at different temperatures. In general, dielectric relaxation time varies with the inter molecular forces acting between the molecules in the selected liquid mixtures. Brompheniramine is one of the critical compounds of an amine group with spectacular applications, including pharmaceutical industries [7]. Higher carbon chain length alcohols are having self associated and proton donating ability in the liquid mixtures. The variations in the dielectric constant (є’), dielectric loss (є’’), static dielectric constant (є0) and the dielectric constant at an optical frequency (є∞) with a range of brompheniramine concentrations with 1-butanol,1-pentanol and 1-hexanol systems are useful in the applied research and chemical industries. Moreover, the variations in the dielectric constant and dielectric relaxation time should be useful in the analysis of intermolecular interaction between the functional group of the selected liquid mixtures. This research work attempts to analyse the intermolecular interaction between the brompheniramine and 1-butanol,1-pentanol and 1-hexanol at 303K using time domain reflectometry techniques.

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