Induced smectic and chiral smectic phase in racemic mixture of cholesteryl compounds

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