NEAR-CRITICAL PHASE-BEHAVIOR OF DILUTE MIXTURES - COMMENT

The recently published (Gude, M. T., and Teja, A. S., 1994, Molec. Phy s., 81, 599) expression for al-derivative/partial-derivativex2)rho,T(i nfinity) is demonstrated to be valid only at the solvent critical poin t, and the more general microscopic connection is shown between the is othermal-isochoric finite pressure change l-derivativeP/partial-deriva tivex2)rho,T(infinity) and the rearrangement of the solvent structure around an infinitely dilute solute. Finally, there is discussion of so me properties of this derivative and some theoretical implications in the interpretation of solvation at near critical conditions.