Volume Phase Transitions of Gels in Liquid Crystal Solvents

Author(s):  
Akihiko Matsuyama ◽  
Rie Morii ◽  
Tadaya Kato
1993 ◽  
Vol 07 (18) ◽  
pp. 1215-1222
Author(s):  
A. L. ALEXE-IONESCU

An orientation transition observed in nematic liquid crystal samples, induced by the thickness, is interpreted in a new way. By supposing that the nematic liquid crystal contains chiral impurities, it is shown that the homeotropic orientation is stable only for thicknesses smaller than a critical one, and is dependent on the concentration of the chiral molecules. At the critical thickness, the transition from the homeotropic orientation to the distorted one is characterized by a tilt angle proportional to the square root of the actual thickness minus the critical one. This trend is typical of second order phase transitions. The agreement between the theory and the experimental data is fairly good over a large range of thickness of the sample.


2021 ◽  
Vol 341 ◽  
pp. 117233
Author(s):  
Natalia Osiecka-Drewniak ◽  
Mirosław A. Czarnecki ◽  
Zbigniew Galewski

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