scholarly journals Dielectric Relaxation Studies of 2-Butoxyethanol with Aniline and Substituted Anilines Using Time Domain Reflectometry

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
P. Jeevanandham ◽  
S. Kumar ◽  
P. Periyasamy ◽  
A. C. Kumbharkhane
Keyword(s):  
Dielectric Constant ◽  
Relaxation Time ◽  
Liquid Mixtures ◽  
Correlation Factor ◽  
Time Domain Reflectometry ◽  
Least Square ◽  
Substituted Anilines ◽  
Dielectric Parameters ◽  
Kirkwood Correlation Factor ◽  
Least Square Fit

The complex dielectric spectra of 2-butoxyethanol with aniline and substituted anilines like aniline, o-chloroaniline, m-chloroaniline, o-anisidine and m-anisidine binary mixtures in the composition of different volumes of percent (0%, 25%, 50%, 75%, and 100%) have been measured as a function of frequency between 10 MHz and 30 GHz at 298.15 K. The dielectric parameters like static dielectric constant ε0 and relaxation time τ have been obtained by using least square fit method. By using these parameters ε0,τ, effective Kirkwood correlation factor geff, corrective Kirkwood correlation factor gf, Bruggeman factor fB, excess dielectric constant εE, and excess inverse relaxation time 1/τE values are calculated and discussed to yield information on the dipolar alignment and molecular rotation of the binary liquid mixtures. From all the derived dielectric parameters, molecular interactions are interpreted through hydrogen bonding.

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.

scholarly journals Dielectric properties of benzylamine in 1,2,6-hexanetriol mixture using time domain reflectometry technique

2016 ◽  
Vol 06 (04) ◽  
pp. 1650034
Author(s):  
M. B. Swami ◽  
P. G. Hudge ◽  
V. P. Pawar
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Binary Mixtures ◽  
Time Domain ◽  
Complex Permittivity ◽  
Intramolecular Interaction ◽  
Correlation Factor ◽  
Time Domain Reflectometry ◽  
Least Square ◽  
Kirkwood Correlation Factor

The dielectric properties of binary mixtures of benzylamine-1,2,6-hexantriol mixtures at different volume fractions of 1,2,6-hexanetriol have been measured using Time Domain Reflectometry (TDR) technique in the frequency range of 10 MHz to 30 GHz. Complex permittivity spectra were fitted using Havriliak–Negami equation. By using least square fit method the dielectric parameters such as static dielectric constant ([Formula: see text]), dielectric constant at high frequency ([Formula: see text]), relaxation time [Formula: see text] (ps) and relaxation distribution parameter ([Formula: see text]) were extracted from complex permittivity spectra at 25[Formula: see text]C. The intramolecular interaction of different molecules has been discussed using the Kirkwood correlation factor, Bruggeman factor. The Kirkwood correlation factor ([Formula: see text]) and effective Kirkwood correlation factor ([Formula: see text]) indicate the dipole ordering of the binary mixtures.

scholarly journals Dielectric Relaxation and Thermodynamic Study of Caffeine-Chloroform Solution using TDR

2021 ◽  
Vol 9 (VII) ◽  
pp. 3870-3874
Author(s):  
A. R. Lathi
Keyword(s):  
Dielectric Constant ◽  
Relaxation Time ◽  
Time Domain ◽  
Complex Permittivity ◽  
Chloroform Solution ◽  
Time Domain Reflectometry ◽  
Least Square ◽  
Enthalpy Of Activation ◽  
Least Square Fit ◽  
Entropy Of Activation

The Complex permittivity of caffeine – Chloroform solution for different temperature and various concentrations have been measured in the range of 10MHZ to 30 GHz using Time Domain Reflectometry. From complex permittivity spectra, Static dielectric constant (εo) and relaxation time (τ) were determined using nonlinear least square fit method. Using Erying rate equation, for different molar concentration of caffeine Enthalpy of Activation ∆H and Entropy of Activation ∆S were determined.

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.

scholarly journals Dielectric Relaxation Studies of Ethyl Formate with Primary Alcohols using Time Domain Reflectometry

2012 ◽  
Vol 9 (1) ◽  
pp. 81-83 ◽  
Author(s):  
S. Elangovan ◽  
S. Mullainathan
Keyword(s):  
Dielectric Constant ◽  
Relaxation Time ◽  
Dielectric Relaxation ◽  
Chain Length ◽  
Ethyl Formate ◽  
Time Domain Reflectometry ◽  
Carbon Chain Length ◽  
Primary Alcohols ◽  
Dielectric Parameters ◽  
Relaxation Studies

Dielectric relaxation studies of ethylformate with 1-propanol,1-butanol and 1-pentanol binary mixtures have been carried out at micro frequency range 9.36 GHZ at temperature of 303K.Different dielectric parameters like dielectric constant(ε’ ),dielectric loss (ε’’) ,Static dielectric constant (ε0) and dielectric constant at optical frequency (ε∞) have been determined. The Relaxation time (ε) has been obtained by Higasi and Cole-Cole method. The dielectric constant (τ0) and relaxation time (τ) decreased with increasing the concentration of ethylformate in alcohol system. The relaxation time (τ) increased with increase in chain length of the alcohols. The result shows that the strength of this molecular interaction depends upon the carbon chain length of the alcohols. Hence the proton donating ability of alcohols is in the order of 1-propanol<1-butanol<1-pentanol

scholarly journals Configurational Statistics

1978 ◽  
Vol 21 (85) ◽  
pp. 73-83 ◽  
Author(s):  
J. F. Nagle
Keyword(s):  
Dielectric Constant ◽  
Long Range ◽  
Short Range ◽  
Theoretical Calculations ◽  
Correlation Factor ◽  
Residual Entropy ◽  
Dipolar Interactions ◽  
Computational Tool ◽  
Kirkwood Correlation Factor ◽  
Polarization Factor

Abstract Theories of the dielectric constant in ice differ in three fundamentally different ways that are often confused with each other. First, there is the choice of interactions to include in the model, notably whether to try to include long-range dipolar interactions as in the Kirkwood theory or to include only the short-range ice-rule interactions. Second, there is the choice of the kind of statistical quantity calculated, e.g. the Kirkwood correlation factor g or the polarization factor G, which Stillinger and Cotter showed to be different. Finally, there is the choice of the kind of computational tool used, and in original papers this choice often obscures the first two differences. With these distinctions in mind a review is given of current theoretical calculations of the dielectric constant and the residual entropy and how the different theories relate to each other and to experiments.

Static Dielectric Constant as a Textural Index of Snow

1985 ◽  
Vol 6 ◽  
pp. 203-206 ◽  
Author(s):  
A. Denoth
Keyword(s):  
Dielectric Constant ◽  
Liquid Water ◽  
Strong Dependence ◽  
Liquid Water Content ◽  
Dielectric Constants ◽  
Least Square ◽  
Static Dielectric Constant ◽  
Shape Factors ◽  
Least Square Fit ◽  
Snow Samples

The dielectric constants of alpine snow samples with different stages of metamorphism and with different liquid water saturations have been measured in the frequency range of 10Hz to 50MHz using a plate condenser and network-analyzer. The limiting static dielectric constant, €s’, has been derived from the measured frequency dependence of the complex permittivity of snow by a least-square-fit using the model of Cole-Cole. A strong dependence of e on porosity, liquid water content and on the shape of the snow grains was found. Calculations of shape factors from the measured static permittivity based on the model of Polder and van Santen are given, and are compared to shape factors derived from an analysis of photographs of the snow samples.

Molecular Interaction Analysis on the Mixture of Amines with Amide Based on Excess Dielectric Parameters by Time Domain Reflectometry Method

2019 ◽  
Vol 16 (2) ◽  
pp. 580-584
Author(s):  
V. Ramalakshmi ◽  
U. Sankar ◽  
G. Parthipan
Keyword(s):  
Dielectric Constant ◽  
Time Domain ◽  
Molecular Interaction ◽  
Interaction Analysis ◽  
Debye Model ◽  
Time Domain Reflectometry ◽  
Dielectric Parameters ◽  
Constant E ◽  
Model Formation ◽  
Correlation Factors

The dielectric relaxation study of amines and amide binary mixture has been determined over the frequency range of 10 MHZ to 20 GHZ, at 30 °C using time domain reflectometry (TDR) method for 11 concentrations of the system. The present work reveals molecular interaction between amines and amide. The static dielectric constant (ɛ), dielectric constant at high frequency (ɛ∞), relaxation time (τ), Effective Kirkwood correlation factors (geff) and Kirkwood correlation factors (gf) are computed by using Debye model. Formation of multimers in the mixture is identified by excess parameters and corresponding results are interpreted.

scholarly journals Configurational Statistics

1978 ◽  
Vol 21 (85) ◽  
pp. 73-83
Author(s):  
J. F. Nagle
Keyword(s):  
Dielectric Constant ◽  
Long Range ◽  
Short Range ◽  
Theoretical Calculations ◽  
Correlation Factor ◽  
Residual Entropy ◽  
Dipolar Interactions ◽  
Computational Tool ◽  
Kirkwood Correlation Factor ◽  
Polarization Factor

AbstractTheories of the dielectric constant in ice differ in three fundamentally different ways that are often confused with each other. First, there is the choice of interactions to include in the model, notably whether to try to include long-range dipolar interactions as in the Kirkwood theory or to include only the short-range ice-rule interactions. Second, there is the choice of the kind of statistical quantity calculated, e.g. the Kirkwood correlation factor g or the polarization factor G, which Stillinger and Cotter showed to be different. Finally, there is the choice of the kind of computational tool used, and in original papers this choice often obscures the first two differences. With these distinctions in mind a review is given of current theoretical calculations of the dielectric constant and the residual entropy and how the different theories relate to each other and to experiments.

Sign in / Sign up

Export Citation Format

Share Document