Evidence for the "Correlated Layer" Effect on the Effective Viscosity from Brownian Motion in a Ternary Liquid Mixture

The translational diffusion coefficient of Brownian particles in the ternary liquid mixture water-ethanol-chloroform near a plait point has been studied by the autocorrelation spectroscopy method. It is found that the effective viscosity ηeff exhibits a strong anomaly close to the plait point. This anomaly can be explained in terms of the existence of a "correlated layer" of liquid mixture of thickness equal to the correlation length ξ on the surfaces of the Brownian particles.