Investigation on the Surface Tension and Viscosity of (dimethylsulfoxide + alcohol) Mixtures by Using Gradient Theory and Eyring’s Rate Theory

The present study has been dedicated to modeling the surface tension and viscosity of (dimethylsulfoxide + alcohol) mixtures. The self and cross-association have been considered for both alcohol and dimethylsulfoxide, and the Cubic-Plus-Association equation of state is applied to the phase equilibrium calculations. The binary interaction parameters are obtained according to the experimental phase equilibrium data, taking advantage of accurate description of the phase equilibrium. Then the gradient theory is used to describe the surface tension and interface of (dimethylsulfoxide + alcohol) mixtures. Moreover, the Eyring’s rate theory is used to model the viscosity of (dimethylsulfoxide + alcohol) binary system. For more accurate description of the viscosity, an adjustable parameter of the Eyring’s rate theory is fitted based on the experimental viscosity data. The results of this investigation show that the application of association performs well for modeling the surface tension and viscosity of (dimethylsulfoxide + alcohol) mixtures.