Orientation effect on sign and magnitude of excess thermodynamic and transport properties of binary liquid mixtures at different temperatures

Abstract

Experimental values of the density (ρ), speed of sound (u), and viscosity (η) have been measured for binary mixtures of 2-chloroaniline with toluene and xylenes (o-xylene, m-xylene, and p-xylene) at temperatures of 303.15, 308.15, 313.15, and 318.15 K over the entire mole fraction range. By using this data, the excess molar volumes (VE), deviation in isentropic compressibility (Δκs), and viscosity deviation (Δη) for the binary systems at the above mentioned temperatures were calculated and fitted to Redlich–Kister equation to determine the fitting parameters and the root-mean-square deviations. The excess molar volumes, deviation in isentropic compressibility, and viscosity deviation and excess Gibbs energy of activation of viscous flow have been analyzed in terms of n–π interactions, charge-transfer complexes, and dipole–induced dipole interaction between unlike molecules. The results obtained for viscosities of binary mixtures were used to test the semi-empirical relations of Grunberg–Nissan, Katti–Chaudhri, and Hind et al., equations.