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The highly chiral compound S ,S-49-~methylbutyl!phenyl-48-~methylbutyl! biphenyl carboxylate ~S ,SMBBPC! undergoes a continuous supercritical evolution from the isotropic (I) phase to the third blue phase ~BPI III!. Mixtures of S ,S-MBBPC and its racemate have been studied with high-resolution calorimetry capable of quantitative latent heat determinations and with optical activity measurements. Both experiments indicate that the first-order BP III–I transition line ends at a critical point when the chiral mole fraction Xc.0.45. Analysis of Cp and optical activity data for the near-critical mixture with X50.45 indicates meanfield behavior instead of the theoretically predicted Ising fluctuation behavior, which would be analogous to that at the liquid-gas critical point of a simple fluid. It is speculated that the Ginzburg criterion can explain this mean-field behavior since the critical regime may be too small for experimental observation, as is the case for almost all Smectic-A–Smectic-C transitions. @S1063-651X~96!09605-5#

Critical point for the blue-phase-III–isotropic phase transition in chiral liquid crystals