Phase transition studies of some cholesteric liquid crystals and their mixtures using dielectric, optical transmittance and density measurement techniques Original Research Article

Investigations of the phase transitions in cholesteryl oleyl carbonate, cholesteryl stearate and their mixtures have been made by measuring dielectric parameters, (ϵ′) and (ϵ″), percentage optical transmittance and density in the temperature range of 15–85°C. The study of all these parameters clearly indicates sharp discontinuities at transition temperatures exhibiting solid–cholesteric and cholesteric–isotropic phase transitions. Also the transition temperatures for both solid–cholesteric and cholesteric–isotropic transition vary with concentration of cholesteryl stearate and show almost a linear behaviour.