Interdiffusion coefficient and dynamic viscosity for the mixture 2,6-lutidine plus water near the lower consolute point

The mixture, 2,6-lutidine + water has a lower consolute point at a temperat ure of 33.9 degrees C and a lutidine concentration of 2.78 M. The interdiff usion coefficient of this mixture was measured over a wide range of concent rations along the isotherms at 25.00 degrees C and 33.00 degrees C, and ove r a wide range of temperatures along the critical isopleth. Critical slowin g down of diffusion was evident along all three paths. The dynamic viscosit y was measured along the isotherm at 25.00 degrees C and along the critical isopleth at temperatures below critical. Along the critical isopleth, the viscosity increased rapidly as the critical temperature was approached. The se data are discussed in terms of the cross-over function theory, which is used to connect divergent data near the critical point to smoothly varying data away from the critical point.