The Temperature Sensitivity of the Selective Reflection by Cholesteric Mesophases and Its Possible Limitations

The selective reflectance of S-cholesteryl 14-phenyltetradecanethioate was determined as a function of the wavelength and temperature at several constant values of temperature and wavelength respectively. The dependence of wavelength λp measured at maximum selective reflectance on temperature T could be curve fitted within the measurement uncertanty of ±0.2m°C to Keating's formula and to the empirical expression λp= λp + A (T - T 0)−2. Since T0 …