A. Nesrullajev et N. Kazanci, Lyotropic nematic mesophases: investigations of mesomorphic and thermo-optical properties, MATER CH PH, 62(3), 2000, pp. 230-235
Investigations of mesomorphic and thermo-optical properties of lyotropic ne
matic-calamitic (N-c) and nematic-discotic (N-d) mesophases are described.
The peculiarities of microscopic textures and the temperature and concentra
tion changes of the refractive index and birefringence have been studied. T
he nematic-isotropic liquid phase transition temperatures and the temperatu
re widths of heterophase regions of the phase transitions from the N-c and
N-d mesophases to the isotropic phase have been determined with a high accu
racy.
Thermic hysteresis in the width of heterophase regions of the phase transit
ions between nematic mesophases and isotropic liquid have been found. (C) 2
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