Study of thermodynamic and transport properties of binary liquid mixtures of n-decane with hexan-2-ol, heptan-2-ol and octan-2-ol at T = 298.15 K. Experimental results and application of the Prigogine–Flory–Patterson theory

• The large positive VmE values are obtained for the binary mixtures at 298.15 K.
• Excess isentropic compressibilities for the binary mixtures are positive over the whole composition range.
• The values of G∗E for all binary mixtures are negative over entire mole fraction.
• Viscosities measured for the binary mixtures were correlated with values calculated by various viscosity models.
• PEP theory, Bloomfield and Dewan model and Jouyban–Acree model are also used to correlate the experimental data.

Densities and viscosities of binary mixtures of n-decane with hexan-2-ol, heptan-2-ol and octan-2-ol have been measured over the entire range of composition at T = 298.15 K and at atmospheric pressure. From the experimental values of density and viscosity, the excess molar volumes (VmE) and excess Gibbs energy of activation of viscous flow (G∗E) have been calculated. These results were fitted to Redlich–Kister polynomial equations to estimate the binary coefficients and standard errors. Jouyban–Acree model is used to correlate the experimental values of density, viscosity and ultrasonic velocity at T = 298.15 K. The results of the viscosity-composition are discussed in the light of various viscosity semi-empirical equations. The experimental results have been used to test the applicability of the Prigogine–Flory–Patterson (PFP) theory. The values of Δln η have also been analysed using Bloomfield and Dewan model. The experimental and calculated quantities are used to study the nature of mixing behaviour between the mixtures.