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Guntūr, India

Gowrisankar M.,Jkc College | Venkateswarlu P.,Sv University | Siva Kumar K.,Sv Arts Ug And Pg College Ttds | Sivarambabu S.,Jkc College
Journal of Molecular Liquids | Year: 2012

Densities ρ, viscosities η and ultrasonic sound speed u of pure propiophenone (PP), p-methylacetophenone (p-MeAP), p-chloroacetophenone (p-ClAP) and those of their binary mixtures prepared using N,N-dimethylaniline (N,N-DMA) as a common component, were measured at 303.15 K and 308.15 K over the entire composition range. These experimental data have been used to calculate excess volume V E, excess ultrasonic velocity u E, isentropic compressibility κ s, intermolecular free length L f, acoustic impedance Z, excess isentropic compressibility κ s E, deviation in viscosity Δη and excess Gibbs free energy of activation of viscous flow (G *E) were evaluated. The viscosity data have been correlated using three equations; Grunberg and Nissan, Katti and Chaudhri and Hind et al. The excess/deviations have been fitted by a Redlich-Kister equation and the results are discussed in terms of molecular interactions present in these mixtures. © 2012 Elsevier B.V. All rights reserved. Source


Gowrisankar M.,Jkc College | Venkateswarlu P.,Sv University | Siva Kumar K.,P.A. College | Sivarambabu S.,Acharya Nagarjuna University
Journal of Industrial and Engineering Chemistry | Year: 2014

Measurement of densities (ρ), ultrasonic sound speeds (u) and viscosities (η) has been carried out for binary mixtures of N,N-dimethylaniline (N,N-DMA) with acetone(AC), methylethylketone (MEK), methylpropylketone (MPK), diethylketone (DEK), methylisobutylketone (MIBK), acetophenone (AP), cyclopentanone (CP), cyclohexanone (CH) and 2-methylcyclohexanone (MeCH) and their pure liquids at (303.15K and 308.15)K over the entire composition range. These experimental data have been used to calculate the excess molar volume (VE), deviation in ultrasonic sound velocity (δu), deviation in isentropic compressibility (δκs) and deviation in viscosity (δη) were evaluated. The variation of these properties with composition of the mixtures suggests dipole-dipole interactions and charge transfer complex formation between N,N-dimethylaniline and ketones. The magnitude of the property is found to depend on the chain length of the ketones molecule. These results have been fitted to the Redlich-Kister polynomial equation. The viscosity data have been correlated using three equations; Grunberg and Nissan, Katti and Chaudhri, Hind et al. for the system studied. © 2013 The Korean Society of Industrial and Engineering Chemistry. Source


Vijayalakshmi D.,Sri Venkateswara University | Narasimha Rao C.,Sri Venkateswara University | Gowrisankar M.,Jkc College | Sivakumar K.,P.A. College | Venkateswarlu P.,Sri Venkateswara University
Journal of Molecular Liquids | Year: 2014

Density (ρ) data for binary mixtures of ethyl benzoate (EB) with toluene (T), o-chlorotoluene (o-CT), m-chlorotoluene (m-CT) and p-chlorotoluene (p-CT) were measured as a function of mole fraction at temperatures 298.15, 303.15, 308.15 and 313.15 K. Further, speeds of sound (u) and viscosity (η) data for the same binary mixtures were also measured as a function of mole fraction at temperatures 303.15 and 313.15 K. From the experimental data, excess volume (VE), isentropic compressibility (κs), excess isentropic compressibility (κs E), deviation in viscosity (η), deviation in intermolecular free length (Lf), deviation in acoustic impedance (Z) and Gibb's free energy of activation of viscous flow (G*E) have been computed. The variations in these properties with composition for all the binary mixtures suggest that the dipole-dipole interactions, electron donor-acceptor interactions, n-π interactions and charge-transfer complex formation between ethyl benzoate with toluene and isomeric chlorotoluenes were observed. Excess volume (VE) and excess isentropic compressibilities (κs E) were found to be negative over the entire mole fraction range of ethyl benzoate indicating the presence of dipole-dipole interactions between the unlike molecules in the mixtures. The negative deviation in viscosity (η) values was attributed to mutual loss of specific interactions between unlike molecules. The excess/deviation parameters were compared with various theoretical models. The results were discussed in terms of molecular interactions present in these mixtures. © 2014 Elsevier B.V. Source


Gowrisankar M.,Jkc College | Venkateswarlu P.,Sv University | Sivakumar K.,P.A. College | Sivarambabu S.,Acharya Nagarjuna University
Journal of Solution Chemistry | Year: 2013

Densities, ρ, viscosities, η, and ultrasonic sound velocities u of pure methyl isobutylketone, diethylketone, cyclopentanone, cyclohexanone, 2-methyl cyclohexanone and those of their binary mixtures with N-methyl aniline were measured at 303.15 K over the entire composition range. These experimental data have been used to calculate the excess volume (V E), deviation in ultrasonic sound velocity (δu), isentropic compressibility (κ s ), intermolecular free length (L f), excess intermolecular free length (LfE L f E), acoustic impedance (Z), excess isentropic compressibility (κSEκ S E), deviation in viscosity (δη) and excess Gibbs energy of activation of viscous flow (G E). The viscosity data have been correlated using three equations proposed by Grunberg and Nissan, Katti and Chaudhri, and Hind et al. The excess/deviations have been fitted by Redlich-Kister equation and the results are discussed in terms of molecular interactions present in these mixtures. © 2013 Springer Science+Business Media New York. Source


Gowrisankar M.,Jkc College | Venkateswarlu P.,Sv University | Sivakumar K.,P.A. College | Sivarambabu S.,Acharya Nagarjuna University
Arabian Journal of Chemistry | Year: 2013

Measurement of densities (ρ), viscosities (η), and ultrasonic speeds (u) has been carried out for binary mixtures of N,N-diethylaniline (N,N-DEA) with acetone (AC), methylethylketone (MEK), methylpropylketone (MPK), diethylketone (DEK), and methylisobutylketone (MIBK), and their pure liquids at 303.15 K and 308.15 K over the entire composition range. These experimental values have been used to calculate the excess molar volume (VE), deviation in ultrasonic speeds (Δu), deviation in isentropic compressibility (Δκs), deviation in intermolecular free length (ΔLf), deviation in acoustic impedance (ΔZ), excess Gibbs free energy of activation of viscous flow (G*E) and deviation in viscosity (Δη). The variation of these properties with composition of the mixtures suggests dipole-dipole interactions and charge-transfer complex formation between N,N-diethylaniline and dipolar ketones. The magnitude of the property is found to depend on the chain length of the ketones' molecule. The viscosity data have been correlated using three equations: Grunberg and Nissan, Katti and Chaudhri and Hind et al. These results have been fitted to the Redlich-Kister polynomial using multiparametric nonlinear regression analysis to estimate the binary coefficients and standard errors. © 2013. Source

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