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

Dielectric Relaxation Studies of Ternary Mixture of Dimethyl Phthalate and Heptanol in Benzene Solution in the Microwave Region

2015 ◽  
Vol 70 (7) ◽  
pp. 507-512
Author(s):  
A. Mushtaq Ahmed Khan ◽  
M. Subramanian
Keyword(s):  
Dielectric Constant ◽  
Dipole Moment ◽  
Relaxation Time ◽  
Dielectric Relaxation ◽  
Benzene Solution ◽  
Microwave Frequency ◽  
Viscous Force ◽  
Dimethyl Phthalate ◽  
Flow Process ◽  
Relaxation Studies

AbstractThe molecular structure and molecular forces in liquids and solutions, in particular, have been investigated by dielectric relaxation studies. The nature and strength of the molecular interactions have been established as the main cause for the chemical behaviour of compounds. The dielectric behaviour of dimethyl phthalate with heptanol in benzene solution has been studied at a microwave frequency of 9.36 GHz at different temperatures 303, 308, and 313 K. Different dielectric quantities such as dielectric constant (ε′), dielectric loss (ε″), static dielectric constant (ε0), and dielectric constant at optical frequency (ε∞) have been determined. The relaxation time τ has been calculated by both Higasi’s method and Cole–Cole method. The dielectric relaxation process can be treated as a rate process just like the viscous flow process. The complex system investigated shows the maximum relaxation time values at high temperatures by both Higasi’s method and Cole–Cole method. The molar free energies of activation of dipole moment (ΔFτ) and viscous force (ΔFη) have also been reported. The excess dipole moment is also determined. The excess dipole moment is a qualitative index for the presence of a hydrogen bond in the ternary system. The value of Δμ obtained in our study indicates the presence of hydrogen bonds between the components of the mixture. The system investigated shows that the relaxation time value increases with the increase in the concentration of solute.

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.

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.

Dielectric relaxation, viscosity and freezing

1957 ◽  
Vol 240 (1220) ◽  
pp. 101-107 ◽  
Keyword(s):  
Dielectric Constant ◽  
Relaxation Time ◽  
Solid State ◽  
Dielectric Relaxation ◽  
Simple Relation ◽  
Experimental Results ◽  
Organic Liquids ◽  
Dielectric Relaxation Time ◽  
Polar Liquids ◽  
Molecular Radius

It is shown that polar liquids may be divided into two classes according to whether or not the rotation of the dipoles is prevented by solidification. For liquids belonging to the first class, and having rigid molecules, an equation similar to Debye’s can be used to relate the dielectric relaxation time and the viscosity. This equation does not involve the ‘molecular radius’ which has always made the interpretation of Debye’s equation uncertain, and it can, in consequence, be used to determine from the experimental results how the ratio of the microscopic to the macroscopic relaxation time ( ז/ז ') depends on the static dielectric con­stant. The theory has been applied to a number of organic liquids of rigid molecular struc­ture, and indicates that the dependence of ז/ז ' on the dielectric constant is best expressed by Powles’s equation ז/ז ' = (2∊ 0 + ∊ ∞ )/3∊ 0 . For liquids belonging to the second class no simple relation between dielectric relaxation time and viscosity can be expected, but it may be possible to relate the relaxation time in some way to the transition which occurs in the solid state, in which the freedom of dipole rotation is lost.

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