Eyring Functions of Activation for the Viscous Flow of Some Higher Alcohols in Cyclohexane Solutions

Abstract

The viscosities of solutions of 1-octanol, 1-nonanol, and 1-decanol in cyclohexane up to concentrations of 1.56 molċkg−1 were determined in the temperature range from 293.15 to 333.15 K. Applying Eyring’s transition state theory, the Eyring functions of activation for the viscous flow of binary mixtures, i.e. the molar Gibbs free energy, entropy, and enthalpy were estimated. The correlation coefficients β Y (Y=G, H, or S) were derived and used to discuss the initial effect of the solute on the activation parameters for the viscous flow. From the partial molar thermodynamic functions of activation and the partial molar volumetric data of solute and solvent at infinite dilution, the viscosity coefficient B was determined. For the interpretation of the experimental data, the Unified Interaction Parameter Formalism was used.