![]() Viscosities ( η ) of binary mixtures between some polar aliphatic molecules viz. The variations of derived parameters mentioned above with composition offer a convenient method to study the nature and extent of interactions between the component molecules of the liquid mixtures, not easily obtained by other means Moreover, V E values were theoretically predicted by using Flory’s statistical theory. Partial molar volumes (V 0 φ,2 ) and partial molar compressibilities (K 0 φ,2 ) of 1-butanol and 2-butanol in cyclohexane have also been evaluated. The sign and magnitude of these parameters were found to be sensitive towards interactions prevailing in the studied systems. From the experimental data the excess molar volume (V E ), deviations in isentropic compressibility (Δk s ), deviations in viscosity (Δη), deviations in ultrasonic speed (Δu), deviations in acoustic impedance (ΔZ), deviations in internal pressure (ΔPi), excess Gibbs free energy of activation (Δ G*E ), entropies (ΔS*), and enthalpies (ΔH*) of activation of viscous flow have been determined. The densities (ρ), viscosities (η), and ultrasonic speeds (u) of pure cyclohexane, 1-butanol, 2- butanol, and those of their binary mixtures, with cyclohexane as common component, covering the whole composition range have been measured at 293.15, 298.15, 303.15, 308.15, 313.15, and 318.15 K.
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