Shear-Viscosity Behavior near the Double Critical Point of the Mixture 3-Methylpyridine, Water, and Heavy Water

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We have measured the shear viscosity of ternary mixtures of 3-methylpyridine, water (H₂O), and heavy water (D₂O) as a function of temperature for ten different concentrations, some of which were very near the double-critical-point concentration of this mixture. The exponent to describe the power-law divergence in temperature of the viscosity nearly doubles as the concentration approaches the double-critical-point concentration.