Internal pressure, ultrasonic velocity and viscosity of binary liquid mixture containing (1, 4-dioxane + 1-octanol) at different temperature and under atmospheric pressure

Experimental measurements of density, viscosity, and sound speed at 298.15 K and atmospheric pressure are reported for the binary liquid mixture of 1,4-dioxane (1) + 1-octanol (2). Based on these experimental data, various thermodynamic excess and deviation properties were calculated and fitted using the Redlich-Kister polynomial equation. The variation of these properties with composition has been analyzed in terms of molecular interactions between the mixture components and structural effects. From the experimental data, excess molar volume (VE), excess adiabatic compressibility (βadE ), excess viscosity (ηE ), excess intermolecular free length (LfE) , and excess internal pressure (PiE) were determined. These properties were found to be negative at all measured temperatures. The results have been interpreted in terms of the nature of molecular interactions between the components of the mixture.