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Sivarambabu Sakamuri,Gowrisankar Manukonda,Venkateswarlu Ponneri,Sivakumar Kasibhatta 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.5
The density, ultrasonic velocity of sound and viscosity of binary mixtures of N,N-dimethyl aniline (N,NDMA)with 1-propanol, +2-propanol, +1-butanol, +2-butanol, +1-pentanol, +2-methyl-1-propanol, +2-methyl-2-propanol were measured at 303.15 K. These experimental data have been used to calculate excess volume V E, excess ultrasonic speeds uE, excess intermolecular free length Lf E, excess acoustic impedance Z E, excess isentropic compressibility κs E, deviation in viscosity Δη and excess Gibbs free energy of activation of viscous flow (G*E ). The values of Lf Eand κs E are negative over the wide range of composition for all the binary mixtures, while the values of Z Eare positive. These results have been used to discuss the nature of interaction between unlike molecules in terms of hydrogen bonding, dipole-dipole interaction, proton-acceptor interaction and dispersive forces. The viscosity data have been correlated using three equations: Grunberg and Nissan, Katti & Chaudhri and Hind et al. The excess/deviations were fitted by a Redlich-Kister equation and the results were analyzed in terms of specific interactions present in these mixtures.
Gowrisankar, M.,Sivarambabu, S.,Venkateswarlu, P.,Kumar, K. Siva Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.5
Densities (${\rho}$), Viscosities (${\eta}$) and ultrasonic speeds (u) of pure acetophenone (AP), propiophenone (PP), $p$-methyl acetophenone ($p$-MeAP), $p$-chloroacetophenone ($p$-ClAP) and those of their binary mixtures with $N$-ethyl aniline ($N$-EA) as a common component, were measured at 303.15 K over the entire composition range. These experimental data were used to calculate the excess volume $V^E$, deviation in ultrasonic speeds ${\Delta}u$, isentropic compressibility $K_s$, intermolecular free length $L_f$, acoustic impedance Z, deviations in isentropic compressibility ${\Delta}K_s$, deviation in viscosity ${\Delta}{\eta}$ and excess Gibbs free energy of activation of viscous flow ($G^{*E}$) at all mole fractions of $N$-ethyl aniline. These parameters, especially excess functions, are found to be quite sensitive towards the intermolecular interactions between component molecules. Theoretical values of viscosity of the binary mixtures were calculated using different empirical relations and theories. The relative merits of these relations and theories were discussed. The experimental results were correlated by using the polynomial proposed by Redlich-Kister equation.
M. Gowrisankar,S. Sivarambabu,P. Venkateswarlu,K. Siva kumar 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
Measurement of densities (r), ultrasonic sound speeds (u) and viscosities (h) has been carried out forbinary 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 (Me–CH) and their pure liquidsat (303.15 K and 308.15) K over the entire composition range. These experimental data have been used tocalculate the excess molar volume (VE), deviation in ultrasonic sound velocity (Du), deviation inisentropic compressibility (Dks) and deviation in viscosity (Dh) were evaluated. The variation of theseproperties with composition of the mixtures suggests dipole–dipole interactions and charge transfercomplex formation between N,N-dimethylaniline and ketones. The magnitude of the property is foundto 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; Grunbergand Nissan, Katti and Chaudhri, Hind et al. for the system studied.
M. Gowrisankar,S. Sivarambabu,P. Venkateswarlu,K. Siva Kumar 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.5
Densities (ρ), Viscosities (η) and ultrasonic speeds (u) of pure acetophenone (AP), propiophenone (PP), p-methyl acetophenone (p-MeAP), p-chloroacetophenone (p-ClAP) and those of their binary mixtures with N-ethyl aniline (N-EA) as a common component, were measured at 303.15 K over the entire composition range. These experimental data were used to calculate the excess volume VE, deviation in ultrasonic speeds Δu, isentropic compressibility Ks, intermolecular free length Lf, acoustic impedance Z, deviations in isentropic compressibility ΔKs, deviation in viscosity Δη and excess Gibbs free energy of activation of viscous flow (G*E) at all mole fractions of N-ethyl aniline. These parameters, especially excess functions, are found to be quite sensitive towards the intermolecular interactions between component molecules. Theoretical values of viscosity of the binary mixtures were calculated using different empirical relations and theories. The relative merits of these relations and theories were discussed. The experimental results were correlated by using the polynomial proposed by Redlich-Kister equation.