Selective reflection of light in binary mixtures composed of compounds with different polarity

Abstract

In the mixture of two nonpolar compounds with the destabilization of smectic A phase the selective reflection of the light is from red to blue with increasing temperature and in the mixture of two polar compounds with the induction of smectic Ad phase the selective reflection of the light is from blue to red with increasing temperature. To check if the polarity of compounds are responsible for the differens in colour changes of the selectively reflected light two nonpolar, two polar, and polar and nonpolar compounds were mix together. It was found that the polarity of compounds do not influence the colour sequence only the distance of the compositions giving selective reflection of the light in the temperature-concentration scale from smectic phase.