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Abstract
We used polarized light microscopy and optical activity measurements in order to determine the BPIII-Isotropic critical point in CB15-E9 mixtures. The complete phase diagram is compared with that of mixtures of S,S-4″(methylbutyl)phenyl-4′-(methylbutyl)biphenylcarboxylate (CE2) and its racemate in which the BPIII-isotropic critical point was first observed. The effect of electric fields on the critical point was also investigated.