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Rathnam M.V.,Physical Chemistry Research Laboratory | Mohite S.,Physical Chemistry Research Laboratory | Nandini M.,P.A. College
Journal of Molecular Liquids | Year: 2013

Measurements of densities ρ, viscosities η, and refractive indices nD have been carried out for binary mixtures of diethyl carbonate (DEC) with acetophenone, cyclopentanone, cyclohexanone, and 3-pentanone over the entire composition range at the temperatures (303.15, 308.15 and 313.15) K and at atmospheric pressure. From these experimental data, the excess volumes V E, deviation in viscosity Δη and deviation in molar refraction ΔR have been calculated. The Redlich-Kister polynomial equation has been used to estimate the binary fitting parameters and the standard errors. The Prigogine-Flory-Patterson (PFP) theory and its applicability in predicting VE at (303.15, 308.15 and 313.15) K has been tested. The experimental viscosities were analyzed on the basis of Lobe and Auslaender models. Further different mixing rules have been applied to predict the refractive index values of the studied mixtures. © 2012 Elsevier B.V. All rights reserved.


Rathnam M.V.,Physical Chemistry Research Laboratory | Ambavadekar D.R.,Physical Chemistry Research Laboratory | Nandini M.,P.A. College
Journal of Chemical and Engineering Data | Year: 2013

Densities, viscosities, and speeds of sound for the binary mixtures of hexyl acetate with tetrahydrofuran, 1,4-dioxane, anisole, and butyl vinyl ether were measured at (298.15, 303.15, 308.15, and 313.15) K. From the experimental data, values of excess volume, VE, deviation in viscosity Δη, and deviation in isentropic compressibility ΔKS, have been calculated. These results were fitted to Redlich-Kister polynomial equation. The excess volumes VE and deviations in isentropic compressibility ΔKs were found to be completely negative, while the deviations in viscosity Δη were found to be either negative or positive depending on the nature of liquid mixtures. © 2013 American Chemical Society.


Rathnam M.V.,Physical Chemistry Research Laboratory | Jain K.,Physical Chemistry Research Laboratory | Kumar M.S.S.,Zulal Bilajirao Patil College
Journal of Chemical and Engineering Data | Year: 2010

Densities, viscosities, and speeds of sound of binary mixtures of ethyl formate with benzene, isopropyl benzene, isobutyl benzene, and butylbenzene have been measured over the entire range of composition, at (303.15, 308.15, and 313.15) K and at atmospheric pressure. The excess volume, VE, deviation in viscosity, Δη, and deviation in isentropic compressibility, ΔKs, have been calculated from the experimental values of density, viscosity, and ultrasonic velocity. The excess volumes are positive, while the deviations in viscosities are negative for all of the studied binary systems over the whole composition range. The deviation in isentropic compressibility shows both positive and negative deviations for ethyl formate with benzene and isopropyl benzene, and for the remaining systems they are positive. The ability of some of the empirical models to calculate mixing viscosities was also tested. © 2009 American Chemical Society.


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.


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.

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