Effect of Hydrostatic Pressure on the Phase Transition Temperatures of a Nematic Liquid Crystal.

摘要

The note reports the effect of hydrostatic pressure on the mesomorphic phase transition temperatures of p-(p-ethoxyphenylazo)-phenyl undecylenate (PPU),which exhibits a nematic range between 65and 110C at one atmospheric pressure. Pressure up to approximately 25,000psi (about 1,700atms) was reached. The phase diagram of PPU is reported. Detection of the phase change was carried out by the Raman scattering technique.