• Dr. T N GOVINDAIAH

The gist of our study focuses on specific properties-thermal and optical of a system comprising the binary system of 4-heptyl-benzoic acid 4-cyano-phenyl ester (CPHB) and 4-hexyl-4-biphenylcarbonitrile (6CB) mesogens exhibits a very interesting unusual re-entrant smectic-A with the addition of induced chiral smectic phases sequentially when the specimen cooled from its isotropic phase respectively at different temperatures. Experimentally measured temperature and wavelength dependent optical anisotropy of refractive indices has been discussed. X-ray studies are helps us to understand the aggregated nano crystalline size of the liquid crystalline phase. Dispersive power has also bee discussed with the help of different combinations of wavelengths.

Optical studies: wavelength dependent Refractive indices: Re-entrant smectic: X-Ray studies: Dispersive power:

"Optical Anisotropy of Dispersive Power Studies on Re-entrant Smectic-A Phase of Liquid Crystals ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 11, page no.c46-c53, November-2022, Available :http://www.jetir.org/papers/JETIR2211203.pdf

"Optical Anisotropy of Dispersive Power Studies on Re-entrant Smectic-A Phase of Liquid Crystals ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 11, page no. ppc46-c53, November-2022, Available at : http://www.jetir.org/papers/JETIR2211203.pdf