On a generalization of the Rapini-Papoular expression of the surface free energy for nematic liquid crystals

1991 ◽  
Vol 1 (12) ◽  
pp. 1505-1513 ◽  
Author(s):  
G. Barbero ◽  
Z. Gabbasova ◽  
Yu. A. Kosevich
Keyword(s):  
Free Energy ◽  
Liquid Crystals ◽  
Surface Free Energy ◽  
Nematic Liquid Crystals

Spontaneously Twisted Nonchiral Nematic Liquid Crystals

1990 ◽  
Vol 45 (6) ◽  
pp. 783-789 ◽  
Author(s):  
A. Chrzanowska
Keyword(s):  
Free Energy ◽  
Liquid Crystals ◽  
Elastic Constant ◽  
Nematic Liquid Crystals ◽  
Model Potential ◽  
Higher Order ◽  
Microscopic Model ◽  
Stability Conditions ◽  
Higher Order Terms ◽  
Potential Stability

AbstractNematic liquid crystals exhibiting a negative K2 elastic constant are discussed on the basis of a microscopic model potential. Stability conditions are satisfied by taking into account higher order terms in the expansion of the free energy. A continuous Freederiks effect is predicted for systems with negative K2.

Effect of Temperature on the Columnar Tilt of Discotic Liquid Crystals

2010 ◽  
Vol 428-429 ◽  
pp. 186-193 ◽  
Author(s):  
Wen Jun Zheng ◽  
Chen Yan Chiang ◽  
Chi Wi Ong
Keyword(s):  
Free Energy ◽  
Liquid Crystals ◽  
Surface Free Energy ◽  
Substrate Surface ◽  
Effect Of Temperature ◽  
Discotic Liquid Crystals ◽  
Columnar Phase ◽  
Mechanical Shearing

The effect of temperature on the tilt of discotic columns in a columnar phase has been studied. The homogenous alignment of discotic columns is achieved by applying a mechanical shearing. In the columnar phase, the tilt of the discotic columns at substrate surface is found to change with temperature. A decrease in the temperature of the substrates causes an increase in the pretilt of the discotic columns. The phenomenon is explained based on the consideration of surface free energy at the interface of the substrate.

Sign in / Sign up

Export Citation Format

Share Document