Viscosity of binary liquid mixtures near the critical mixing point

Abstract

An experimental study has been made of the increase in visocisty that occurs for a binary liquid mixture close to the critical mixing point. Viscosities are reported at several temperatures and over the entire composition range for the systems phenol + water, aniline + cyclohexane, methanol + n-hexane, and methanol + cyclohexane. Comparison of the experimental results with the predictions of Fixman's theory of the anomalous viscosity effect reveals that the temperature dependence of the excess viscosity is well described by the theory. However, the theory is less successful in predicting the effect of composition on excess viscosity.