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Rander D.N.,Lal Bahadur Shastri Mahavidyalaya | Joshi Y.S.,Lal Bahadur Shastri Mahavidyalaya | Kanse K.S.,Lal Bahadur Shastri Mahavidyalaya | Kumbharkhane A.C.,Srtmuniversity
Thermochimica Acta | Year: 2017

The measurement of complex permittivity spectra of binary mixtures of sugar alcohols with DMSO were carried out using picosecond time domain technique at the temperatures ranging from 283.15 K to 298.15 K. In order to obtain the dielectric parameters, the measured complex permittivity spectra were fitted to the Cole-Davidson model. These dielectric parameters are further used to evaluate the Kirkwood correlation factor and thermodynamic parameters to discuss hydrogen bond formation. © 2017 Elsevier B.V.


Karthick N.K.,Thiagarajar College of Engineering | Kumbharkhane A.C.,Swami Ramanand Teerth Marathwada University | Joshi Y.S.,Lal Bahadur Shastri Mahavidyalaya | Mahendraprabu A.,Thiagarajar College of Engineering | And 3 more authors.
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2017

Dielectric studies using Time Domain Reflectometry method has been carried out on the binary solution of Ethyl acetate (EA) with Chlorobenzene (CBZ) over the entire composition range. Spectroscopic (FTIR and 13C NMR) signatures of neat EA, CBZ and their equimolar binary solution have also been recorded. The results of the spectroscopic studies favour the presence of (CBZ) C[sbnd]H ⋯ O[dbnd]C (EA), (EA) methylene C[sbnd]H ⋯ π electrons (CBZ) and (EA) methyl C[sbnd]H ⋯ Cl (CBZ) contacts which have been validated using quantum chemical calculations. Dimerization of CBZ has been identified. Presence of β-clusters has been identified in all the solutions. Although EA and CBZ molecules have nearly equal molar volumes, CBZ molecules experience larger hindrance for the rotation than EA molecules. Very small excess dielectric constant (εE) values may be correlated with weak heteromolecular forces and/or closed heteromolecular association. © 2017 Elsevier B.V.


Kanse K.S.,Lal Bahadur Shastri Mahavidyalaya | Joshi Y.S.,Lal Bahadur Shastri Mahavidyalaya | Kumbharkhane A.C.,Swami Ramanand Teerth Marathwada University
Physics and Chemistry of Liquids | Year: 2014

The dielectric behaviour of binary mixture of ethanol with chlorobenzene and 1,2 dicholoroethane mixtures for various concentrations and temperatures have been studied using hydrogen-bonded model suggested by Luzar. The Luzar theory is applied to determine the molecular parameters and correlation terms for the mixture. The interaction of the chloro group molecules with ethanol hydrogen-bonded liquid is discussed. The calculation of the theoretical dielectric constant using Kirkwood correlation factor provides more precise theoretical model for the mixture. © 2014, © 2014 Taylor & Francis.


Kumbharkhane A.C.,Swami Ramanand Teerth Marathwada University | Joshi Y.S.,Lal Bahadur Shastri Mahavidyalaya | Mehrotra S.C.,Dr. Babasaheb Ambedkar Marathwada University | Yagihara S.,Tokai University | Sudo S.,Tokyo City University
Physica B: Condensed Matter | Year: 2013

A picosecond time domain reflectometry (TDR) technique was used to measure complex permittivity of water-dioxane mixtures in frequency range of 10-30 GHz covering entire concentrations range and in temperature range of 0-25 °C. The Luzar theoretical model is used to compute the binding energies and average number of hydrogen bond for water-water and water-dioxane molecules. The number of hydrogen bond density is found to be maximum for the mixture with water concentration Xw=0.7. The negative values of the excess parameters suggest significant heteromolecular hydrogen bonding interactions between water and dioxane molecules. The relationships between hydrogen bond density as obtained by the Luzar model and excess dielectric parameters is also discussed. © 2013 Elsevier B.V. All rights reserved.


Joshi Y.S.,Lal Bahadur Shastri Mahavidyalaya | Kumbharkhane A.C.,Swami Ramanand Teerth Marathwada University
Fluid Phase Equilibria | Year: 2012

The complex permittivity of 2-butoxyethanol (BE)-water mixtures over entire concentrations has been measured as a function of frequency from 10MHz to 30GHz. All spectra were fitted using Cole-Davidson (CD) relaxation spectral function which gives an asymmetric distribution of relaxation times. As composition of butoxyethanol in water increases the width of distribution function broadens. By using least squares fit method the dielectric parameters such as static dielectric constant (e{open} 0), dielectric constant at high frequency (e{open} ∞), relaxation time (τ) and relaxation distribution parameter (β) were extracted from complex permittivity spectra at temperature range from 25°C to 0°C. The heterogeneous interaction in unlike molecules and intramolecular interaction in same molecules has been discussed using the excess dielectric properties, Kirkwood correlation factor, thermodynamic properties and Bruggeman factor. © 2012 Elsevier B.V.


Joshi Y.S.,Lal Bahadur Shastri Mahavidyalaya | Kumbharkhane A.C.,Swami Ramanand Teerth Marathwada University
Journal of Molecular Liquids | Year: 2011

The dielectric relaxation measurements on binary mixtures of 2-methoxyethanol with water have been carried out over entire concentrations and at temperature range of 0 °C to 25 °C using a picosecond time domain reflectometry technique. The complex dielectric permittivity spectra of 2-methoxyethanol/water mixtures were fitted using Havriliak-Negami equation. The static dielectric constant and relaxation time for all concentrations were obtained using least square fit method. The principal relaxation time is small if compared to that of corresponding alcohol/water mixtures this may be due to the hydrogen bonding ether oxygen in the 2-ME-water system. Excess dielectric properties, Kirkwood correlation factor, thermodynamic properties and Bruggeman factor are also determined and the results are interpreted in terms of heterogeneous interactions among the unlike molecules due to hydrogen bonding. © 2011 Elsevier B.V. All rights reserved.


Joshi Y.S.,Lal Bahadur Shastri Mahavidyalaya | Hudge P.G.,Swami Ramanand Teerth Marathwada University | Kumbharkhane A.C.,Swami Ramanand Teerth Marathwada University | Mehrotra S.C.,Jawaharlal Nehru Technological University Anantapur
Journal of Molecular Liquids | Year: 2011

Complex permittivity spectra of 2(2-alkoxyethoxy)ethanol-water mixtures for the entire concentration range and at 25 °C have been measured using time domain reflectometry technique up to 30 GHz. The relaxation processes have been obtained by fitting the complex permittivity spectra of the binary mixtures in 2-Debye equation. In glycol ether-water mixtures except for pure water and its rich region the double relaxation times, primary process (τ 1) and secondary process (τ 2) have been observed. The primary relaxation process (τ 1) may be due to cooperative relaxation of the H-bond network of mixture constituents and the secondary relaxation process (τ 2) may be due to its flexible parts attached to the carbon chain. The intra and intermolecular hydrogen bonding of 2(2-alkoxyethoxy)ethanol in pure form as well as in binary mixtures of water have been discussed using Kirkwood correlation factor, Excess dielectric properties and the Bruggeman factor. © 2011 Elsevier B.V. All rights reserved.


Rander D.N.,Lal Bahadur Shastri Mahavidyalaya | Joshi Y.S.,Lal Bahadur Shastri Mahavidyalaya | Kanse K.S.,Lal Bahadur Shastri Mahavidyalaya | Kumbharkhane A.C.,Srtm University
Indian Journal of Physics | Year: 2016

The measurements of complex dielectric permittivity of xylitol–water mixtures have been carried out in the frequency range of 10 MHz–30 GHz using a time domain reflectometry technique. Measurements have been done at six temperatures from 0 to 25 °C and at different weight fractions of xylitol (0 < WX ≤ 0.7) in water. There are different models to explain the dielectric relaxation behaviour of binary mixtures, such as Debye, Cole–Cole or Cole–Davidson model. We have observed that the dielectric relaxation behaviour of binary mixtures of xylitol–water can be well described by Cole–Davidson model having an asymmetric distribution of relaxation times. The dielectric parameters such as static dielectric constant and relaxation time for the mixtures have been evaluated. The molecular interaction between xylitol and water molecules is discussed using the Kirkwood correlation factor (geff) and thermodynamic parameter. © 2015, Indian Association for the Cultivation of Science.


Joshi Y.S.,Lal Bahadur Shastri Mahavidyalaya | Rathod B.A.,Srtm University | Kanse K.S.,Lal Bahadur Shastri Mahavidyalaya | Kumbharkhane A.C.,Srtm University
Journal of Molecular Liquids | Year: 2014

The complex dielectric permittivity spectra of some ethylene glycol ethers i.e. 2(2-alkoxyethoxy)ethanols in 1,4 dioxane have been carried out in the frequency range of 10 MHz to 30 GHz using a time domain reflectometry (TDR) technique. Measurement was done at 25 °C and at entire mol. fractions of dioxane in AEE (0 < XDX ≤ 1.0). Using Cole-Davidson model the dielectric parameters such as static dielectric constant (ε;bsubesub), relaxation time (τ) and asymmetric distribution of relaxation width (β) for the mixtures have been evaluated. The densities of these mixtures were also measured at room temperature. The molecular interaction of unlike molecules was discussed using the excess dielectric properties, excess volumetric properties and Kirkwood correlation factor. © 2014 Elsevier B.V.


Rander D.N.,Lal Bahadur Shastri Mahavidyalaya | Joshi Y.S.,Lal Bahadur Shastri Mahavidyalaya | Kanse K.S.,Lal Bahadur Shastri Mahavidyalaya | Kumbharkhane A.C.,Srtm University
Journal of Molecular Liquids | Year: 2014

Temperature dependent dielectric permittivity of binary mixtures of erythritol & water has been measured using the time domain reflectometry (TDR) technique in the frequency range of 10 MHz to 30 GHz. Measurements were done at different temperatures ranging from 5 °C to 25 °C for different weight fractions of erythritol (0 < WE0.3) in water. The measured dielectric spectra for these mixtures have been fitted using the Cole-Davidson model in order to evaluate the dielectric parameters such as the static dielectric constant and relaxation time for the mixtures. The interactions between erythritol and water molecules are discussed using the Kirkwood correlation factor and thermodynamic parameters. The activation energy is found minimum at 20% of erythritol in water. © 2014 Elsevier B.V.

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