Texture transformations and thermo-optical properties of nematic mesogen at nematic-isotropic liquid phase transition

Study of the thermo-morfologic, thermotropic and thermo-optical properties of monomorphic nematic mesogen has been carried out. Temperature behavior of the mean the refractive index n, ordinary no and extraordinary ne refractive indexes, and birefringence Δn have been investigated. The principal polarizabilities α0 and αe, effective geometry parameter αeg, average polarizability αave and polarizability anisotropy Δα were estimated. Peculiarities of the biphasic regions of the direct nematic mesophase-isotropic liquid and inverse isotropic liquid-nematic mesophase have been investigated.