Phase diagram of a nematic liquid crystal and observation of phase separation

Abstract

A phase diagram of a thermotropic liquid crystal was obtained in a pressure – temperature plane using metal Berthelot tubes. One was built in an observation window, and the other not. Two co-existing lines, namely crystal (Kr) – nematic (N), and isotropic liquid (iL) - nematic (N) lines, were drawn in the plane by the latter tube. It was observed that two phases co-exist along the two lines by the former tube.