Change of thermo-morphologic and thermotropic properties in liquid crystals exhibiting multiple phase transitions

Change of the thermo-morphologic and thermotropic properties of liquid crystals exhibiting multiple phase transitions vs. thickness of liquid crystalline layer have been investigated in this work. The sandwich-cells with 20 μm, 70 μm, 120 μm, 170 μm and 240 μm thicknesses were used. Liquid crystalline materials with smectic C, smectic A and nematic mesophases were objects of investigations. Change of the crystal-smectic C, smectic C-smectic A, smectic A-nematic and nematic-isotropic liquid phase transition temperatures, and transformation of texture from specific types to non-specific types with change of thickness of liquid crystalline layer have been found.