The Temperature Dependence of the Pitch of CEEC

The pitch of cholesteryl 2-(2-ethoxyethoxy) ethyl carbonate (CEEC) is measured as a function of temperature and is shown to increase with increasing temperature, unlike the behavior of other single component cholesteric liquid crystals. We find that improved sample purification shifts the pitch horizontally on the temperature axis, while sample aging causes an increased disorientation of the sample domains themselves.