INDUCED SMECTIC AND CHIRAL SMECTIC PHASE IN RACEMIC-MIXTURE OF CHOLESTERYL COMPOUNDS

The racemic mixture of cholesteryl chloride(ChCl) and cholesteryl myri state(ChMy) exhibit a compensated nematic phase at critical concentrat ion and temperature. The mixtures of concentration from 1 to 10% ChCl and 88% to 100% of ChCl exhibit smectic phase and cholesteric phase re spectively. The middle concentrations are exhibiting S-A-S-c-S-c phas es. Typically the mixture with 72.3% cholesteryl chloride exhibit I-S- A-S-c-S-c phases sequentially. X-ray diffraction, DSC and optical tex ture studies have been carried out for five concentrations. The pitch and tilt angle of the chiral smectic phase is measured. Interesting op tical textures are also illustrated.