In this Activity, students investigate the relationship between temperature and composition and the reflected and transmitted colors of a common nanoscale material, the cholesteric liquid crystal. This Activity is suitable for exploring relationships between color, wavelength, reflection, and transmission and illustrates how temperature changes the Bragg reflection wavelength in liquid crystals. This Activity can also be used to explore the relationship between melting point and crystal packing.
George Lisensky and Elizabeth Boatman, J. Chem Educ. 2005, 82, p1360A.