Fig. 4.

Critical fluctuations in the ternary mixture, C–DPPC–DOPC. (Left) Pseudobinary mixture phase diagram describing liquid–liquid phase separation for compositions along the 1:2 stoichiometric axis (a tie line) where the mole ratio of C to R is maintained at 1:2 (dashed line a–b in Fig. 1). Parameters used are the same as those used to generate the phase diagram for the ternary mixture in Fig. 1. The ternary critical point at 313 K is indicated by the filled circle. (Right) Calculated free energies for compositions along the stoichiometric axis, 5 K above the critical temperature, at the critical temperature, and 5 K below the critical temperature (note different scales). The dashed curve at the critical temperature is the fit to the power series in Eq. 7.