LIQUID CRYSTAL PHASE TRANSITIONS USING FABRY-PEROT ETALON

摘要

Change in the phase of thermotropic liquid crystals occurs at definite phase tran- sition temperatures. A spectroscopic technique using the Fabry-Perot etalon coupled with a spectrometer has been used to determine the mesophase transition temperatures of the liquid crystal - Cholesteryl pelargonate. New mesophase transitions have been detected and classified at the temperatures of 67℃, 75℃, 85℃ and 89℃ in addition to those reported by earlier workers at 77.5℃, 80.5℃ and 92℃. These findings have been corroborated by the analysis of the thermal runs of the same samples using Differential scanning calorimetery.