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Rathnam M.V.,Physical Chemistry Research Laboratory | Mohite S.,Physical Chemistry Research Laboratory | Kumar M.S.,Zulal Bhilajirao Patil College
Journal of the Serbian Chemical Society | Year: 2012

Density, ρ, viscosity, η, and refractive index, n D, were measured for binary mixtures of diethyl malonate with ketones (acetophenone, cyclopentanone, cyclohexanone and 3-pentanone) at temperatures of 303.15, 308.15 and 313.15 K over the entire composition range. The excess volume, VE, deviation in viscosity, Δη, excess Gibb's free energy of activation for viscous flow, ΔG E, and deviation in molar refraction, ΔR, were determined from the experimental data and the computed results were fitted to the Redlich-Kister polynomial equation. The values of V E, Δη, ΔG E, and ΔR were plotted against the mole fraction of diethyl malonate. The observed positive and negative values of the excess parameters for all the studied binary mixtures were explained based on the intermolecular interactions present in these mixtures. Furthermore, different empirical relations were used to correlate the binary mixture viscosities and refractive indices. © 2012 Copyright (CC) SCS. Source


Rathnam M.V.,Physical Chemistry Research Laboratory | Sayed R.T.,Physical Chemistry Research Laboratory | Bhanushali K.R.,Physical Chemistry Research Laboratory | Kumar M.S.S.,Physical Chemistry Research Laboratory | Kumar M.S.S.,Zulal Bhilajirao Patil College
Journal of Molecular Liquids | Year: 2012

Densities (ρ), viscosities (η) and ultrasonic speeds (u) of binary mixtures of methyl benzoate with benzene, isopropyl benzene, isobutyl benzene, acetophenone, cyclopentanone, cyclohexanone or 3-pentanone including those of pure liquids were measured over the entire composition range at temperatures 303.15 and 313.15 K respectively. The excess molar volumes (V E) and the other excess thermodynamic properties such as deviations in isentropic compressibilities (Δk s), ultrasonic speed (δu), viscosity (δη) and excess free energy of activation (δG *E) were calculated using the experimentally measured ρ, η and u respectively. The experimental mixture viscosities were analyzed on the basis of Tamura-Kurata, Heric (2-Parameter), Eyring-Margules and Jouyban-Acree models. A good agreement among experimental data and the values estimated by theoretical procedure was obtained. © 2011 Elsevier B.V. All rights reserved. Source


Rathnam M.V.,Physical Chemistry Research Laboratory | Mohite S.,Physical Chemistry Research Laboratory | Kumar M.S.S.,Physical Chemistry Research Laboratory | Kumar M.S.S.,Zulal Bhilajirao Patil College
Journal of Solution Chemistry | Year: 2011

Densities and viscosities have been determined for binary mixtures of isopropyl acetate or isobutyl acetate with o-xylene, m-xylene, p-xylene and ethyl benzene at (303.15 and 313.15) K for the entire composition range. The excess molar volumes and deviations in viscosity have been calculated from the experimental values. The variations of these parameters, with composition of the mixtures and temperature, have been discussed in terms of molecular interactions occurring in these mixtures. Further, the viscosities of these binary mixtures were calculated theoretically from their corresponding pure component data by using empirical relations, and the results were compared with the experimental findings. © 2011 Springer Science+Business Media, LLC. Source


Rathnam M.V.,Physical Chemistry Research Laboratory | Mohite S.,Physical Chemistry Research Laboratory | Kumar M.S.S.,Zulal Bhilajirao Patil College
Journal of Molecular Liquids | Year: 2011

The densities ρ, viscosities η, and refractive indices n D of binary mixtures of dimethyl carbonate (DMC) with acetophenone, cyclopentanone, cyclohexanone, and 3-pentanone have been measured over the entire range of composition at the temperatures 303.15, 308.15 and 313.15 K and at atmospheric pressure. The density values were used to calculate excess molar volumes VE, and other excess functions of interest such as deviations in viscosity Δη, excess Gibb's free energies of activation of viscous flow ΔGE and deviations in molar refraction ΔR. The measured viscosities were compared with those predicted using the Grunberg-Nissan, Eyring-Margules, Soliman-Marshall, and McAllister four body models. Furthermore the refractive indices data have been correlated using Lorentz-Lorentz, Weiner, Newton, Gladstone-Dale, Eykman, and Eyring-John equations and a satisfactory agreement was found for all the binary systems studied in the present work. © 2011 Elsevier B.V. All Rights Reserved. Source


Rathnam M.V.,Physical Chemistry Research Laboratory | Mohite S.,Physical Chemistry Research Laboratory | Kumar M.S.S.,Zulal Bhilajirao Patil College
Journal of Solution Chemistry | Year: 2010

Viscosity η, and density ρ, of binary liquid mixtures of vinyl acetate or benzyl acetate with o-xylene, m-xylene, p-xylene and ethyl benzene have been determined at (303.15 and 313.15) K for the entire composition range. From the experimental values excess molar volume and deviations in viscosity have been calculated. These excess quantities were fitted to the Redlich-Kister polynomial equation. The viscosity data have been correlated using the Grunberg-Nissan, Tamura and Kurata, Auslander, and Jouyban-Acree models. © 2010 Springer Science+Business Media, LLC. Source

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