Dielectric characterization and molecular interaction behaviour in binary mixtures of methyl acetate with 1-butanol and 1-pentanol

900-910The dielectric constant (ɛs) and relaxation time () of binary mixtures of methyl acetate with alcohols (1-butanol and 1-pentanol) have been investigated at fifteen molar concentrations over the entire mixing range at 288 K, 298 K, 308 K and 318 K using time domain reflectometery technique over the frequency range from 10 MHz to 10 GHz. The relaxation in these mixtures can be described by a single relaxation time using the Debye model. The concentration dependent plots of excess dielectric constant (ɛE), excess inverse relaxation time (1/)E, Kirkwood correlation factor (geff), thermodynamic parameters such as enthalpy of activation (H) and Gibbs free energy (G) of activation and Bruggman factor (fB) have been used to explore the complexes formed between unlike molecules, dipolar ordering, hydrogen bond molecular connectivity’s and their strength in the binary mixtures. Results confirm that there are strong hydrogen-bond interactions between unlike molecules of ester-alcohol mixtures

Microwave dielectric relaxation & polarization study of binary mixture of methylethylketone with nitrobenzene

Present paper reveals detailed study of dielectric relaxation and dielectric polarization and physicochemical study of binary polar-polar liquid mixture i.e. dielectric constant, relaxation time, viscosity, density of methylethylketone (MEK) with nitrobenzene (NB) at 303 K. The measured dielectric and physicochemical parameters employed to acquire additional derived properties like Bruggeman factor, molar refraction and excess properties like static dielectric constant, excess inverse relaxation time, excess molar volume, excess viscosity, excess molar refraction, Gibbs free energy, and enthalpy of activation. The variation of this parameters with composition of these quantities has been used to explain the type, strength and nature of intermolecular interactions between MEK+NB binary mixture. Attained results authenticate that there are strong hydrogen-bond interactions between unlike molecules of different groups of MEK+NB mixtures and that 1:1 complexes are produced and strength of intermolecular interaction rises with rise in concentration of MEK.               KEY WORDS: Bruggeman factor, Excess inverse relaxation time, Dielectric polarization Bull. Chem. Soc. Ethiop. 2019, 33(2), 349-358.DOI: https://dx.doi.org/10.4314/bcse.v33i2.1

Dielectric characterization and molecular interaction behaviour in binary mixtures of methyl acetate with 1-butanol and 1-pentanol

The dielectric constant (ɛs) and relaxation time () of binary mixtures of methyl acetate with alcohols (1-butanol and 1-pentanol) have been investigated at fifteen molar concentrations over the entire mixing range at 288 K, 298 K, 308 K and 318 K using time domain reflectometery technique over the frequency range from 10 MHz to 10 GHz. The relaxation in these mixtures can be described by a single relaxation time using the Debye model. The concentration dependent plots of excess dielectric constant (ɛE), excess inverse relaxation time (1/)E, Kirkwood correlation factor (geff), thermodynamic parameters such as enthalpy of activation (H) and Gibbs free energy (G) of activation and Bruggman factor (fB) have been used to explore the complexes formed between unlike molecules, dipolar ordering, hydrogen bond molecular connectivity’s and their strength in the binary mixtures. Results confirm that there are strong hydrogen-bond interactions between unlike molecules of ester-alcohol mixtures

Influence of soil chemical composition on electrical conductivity

156-161This paper presents the influences of soil chemical composition on electrical conductivity. Electrical conductivity of 150 samples from different locations of Pune district of Maharashtra State was measured. Chemical compositions such as organic carbon, nitrogen, potassium, phosphorous, sodium, calcium carbonate, iron, manganese, zinc and copper were measured. Pearson’s correlation coefficients studies were employed to highlight the influence of the chemical composition on the electrical conductivity. It had been observed that nitrogen, phosphorous, potassium, sodium and calcium carbonate have a significant influence on measured electrical conductivity values. Whereas there had een very low correlation with the organic carbon, iron, manganese, zinc and copper

Influence of soil chemical composition on electrical conductivity

This paper presents the influences of soil chemical composition on electrical conductivity. Electrical conductivity of 150 samples from different locations of Pune district of Maharashtra State was measured. Chemical compositions such as organic carbon, nitrogen, potassium, phosphorous, sodium, calcium carbonate, iron, manganese, zinc and copper were measured. Pearson’s correlation coefficients studies were employed to highlight the influence of the chemical composition on the electrical conductivity. It had been observed that nitrogen, phosphorous, potassium, sodium and calcium carbonate have a significant influence on measured electrical conductivity values. Whereas there had een very low correlation with the organic carbon, iron, manganese, zinc and copper

Microwave spectroscopy modelling for geophysical parameter retrieval using synthetic aperture radar (SAR) dataset

311-314The microwave spectroscopy is an extremely powerful tool for synoptic observation of the object on the earth or planetary bodies. One of the best microwave spectroscopy imaging system is the synthetic aperture radar (SAR) remote sensing. It operates in all weather conditions, though there is change in environmental conditions. In the present study microwave L band SIR-C SAR dataset has been used. The various modellings have been used to classify and analyze the geophysical parameters on the earth or planetary bodies. The modelling makes the process of estimating information beyond the real observation range for data interpretation. In the present paper two most widely used modeling techniques for microwave SAR spectroscopy, i.e., empirical model and an integral equation model (IEM) have been discussed. The aim of the present work is accurate, reliable and skillful measurements of geophysical parameters. In the present work, surface roughness, soil moisture, dielectric constant (ԑ) and backscattering coefficients (σ0) etc. geophysical parameters have been measured with the help of the statistical parameter and occurrence plane estimated from the microwave SAR image

Novel Method for Static Dielectric Constant Measurement of Liquids

The dielectric constant measurement setup has been developed to measure static dielectric constant of liquids at low frequencies using integrated circuit of Monostable Multivibrator. The change in pulse width measured by using Tektronix TDS 2024 four channel digital storage oscilloscope. We can compute change in capacitance and hence calculate static dielectric of liquids. This paper reports the static dielectric constants measured by the technique of some pure polar, nonpolar liquids at 298 K. The details of its interface to measure static dielectric constant of liquids and evaluated results are explained in this paper. The method employed is simple, reliable and repeatability of results is very good