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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.
Bitra Jhansi Lakshmi,Dittakavi Ramachandran,Manukonda Gowrisankar,Chintala Rambabu 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5
We measured densities (ρ), ultrasonic speeds (u) and viscosities (η) for binary binary mixtures of N-ethylaniline(N-EA) with chlorobenzene (CB), bromobenzene (BB), 1,2-dichlorobenzene (1,2-DCB), 1,3-dichlorobenzene (1,3-DCB), and 1,2,4-trichlorobenzene (1,2,4-TCB) and their pure liquids at 303.15 K and 308.15 K. These experimentaldata were used to calculate the excess volume (VE), deviations in ultrasonic speeds (Δu), deviation in isentropic compressibility(Δ κs), deviation in intermolecular free length (ΔLf), deviation in acoustic impedance (ΔZ), deviation in viscosity(Δη) and excess Gibbs free energy of activation of viscous flow (G*E). The variations of these properties withcomposition of binary mixtures suggest loss of dipolar association, difference in size and shape of the component molecules,dipole-dipole interactions and hydrogen bonding between unlike molecules. The viscosity data were correlated withGrunberg and Nissan, Katti and Chaudhri, and Hind et al. equations and the results were compared with the experimentalresults. The excess parameters were fitted to the Redlich-Kister polynomial equation using multi parametric nonlinearregression analysis to derive the binary coefficients and to estimate the standard deviation.