Twisted grain boundary phase in the binary mixture of nematic and cholesteryl compounds.

The binary mixture of cholesteryl nonanoate (CN) and 4,4'-hexyloxy azoxy benzene (HOB) exhibit a very interesting mesophases like blue phase, twisted drain boundary (TCB) phase, induced smectic A, smectic C and smectic B phases at different temperatures when the mixture is coo led from isotropic phase. The existence of TGB phase is confirmed by DSC and optical microscopic studies. The mixtures with concentration 30 to 45% of CN exhibit TGB phase at higher temperature. The optical anisotropy of cholesteric phase is estimated. Numerous interesting optical textures are also illustrated

Induced chiral smectic phase in the mixture of cholesteric and nematic compounds

The Mixture of cholesteryl benzoate (CB) and p-Ethoxy benzolidene-butylaniline (EBBA) exhibit, cholesteric and smectic phases. The sample of 20% concentration of CB shows I-S-A-S-C*-S-E-S-B phases while cooling from isotropic phase. Optical anisotropy of cholesteric phase has been estimated using refractive index data. X-ray, thermal and optical studies have been carried out for smecticA, chiral smectic and smecticE phases. In the case of S-c* phase the `` d' spacing increases with increase of temperature. Pitch of the cholesteric phase and tilt angle of the S-c* phase have been estimated. Interesting optical textures of various concentrations have been illustrated in this investigation

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

Liquid crystalline behaviour of binary mixtures of two non-mesogenic compounds.

Binary mixtures of two novel amphiphilic mixtures of tetradecanol (TDC) and orthophosphoric acid (H3PO4) exhibit an interesting liquid crystalline phases in large range of concentration and temperature, The mixtures in the concentration range between 10 to 60% of TDC in H3PO4 exhibits SA, SD and SE phases. The mixtures with higher concentration of TDC exhibit smectic phases. X-ray, DSC, Optical and NMR studies have been carried out