THEORETICAL SPINODAL FOR TERNARY SOLUTION WITH AN AMPHIPHILE COMPONENT USING A GENERALIZED WHEELER-WIDOM MODEL

摘要

The theoretical spinodal for a ternary solution with an amphiphilic solvent is obtained using a generalized Wheeler-Widom model and a local fitting method applied to every experimental binodal point. This fitting method imposes that the theoretical binodal curve has to pass trough each representative binodal point and that its slope, in each point, must be equal (or as close as possible) to the slope of the corresponding representative experimental binodal. Using the fitting conditions for each experimental binodal, the corresponding theoretical spinodal point is derived, and the theoretical spi nodal is constructed as the interpolation curve for the set of theoretical spinodal points. The results are in agreement with an older method where the local fitting between the theoretical model and the experimental data uses the experimental tie-lines.