Calculation of Nematic-Isotropic Phase Equilibria in Solutions of Polymers in Nematic Liquid Crystals Using the Flory Lattice Model

1986 ◽  
Vol 90 (11) ◽  
pp. 1053-1058 ◽  
Author(s):  
M. Ballauff
Keyword(s):  
Liquid Crystals ◽  
Phase Equilibria ◽  
Lattice Model ◽  
Nematic Liquid Crystals ◽  
Isotropic Phase

Laser Beam Induces Reorientation in Nematic Liquid Crystals

2010 ◽  
Vol 428-429 ◽  
pp. 224-227
Author(s):  
I Min Jiang ◽  
Yu Jen Chen ◽  
Wen Chi Hung ◽  
C.T. Kuo ◽  
D.J. Jang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Laser Beam ◽  
Nematic Liquid Crystals ◽  
Beam Propagation ◽  
Isotropic Phase ◽  
Optical Alignment ◽  
Optically Induced

Nematic liquid crystals (NLCs) can be easily reoriented by the laser beam at the temperature closed to the nematic–isotropic phase transition (TNI). At the temperature closed to TNI, the propagating mode of laser beam and the optically induced phase transition were explored by using a microscopic conoscope technique. This investigation demonstrates the formation of soliton at particular beam propagation modes. The interaction between nematic liquid crystals and the laser beam with different polarizations showed the nonlinearity in optical alignment.

scholarly journals Competition between local disordering and global ordering fields in nematic liquid crystals

2010 ◽  
Vol 6 ◽  
Author(s):  
Matej Cvetko ◽  
Milan Ambrožič ◽  
Samo Kralj
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Anisotropy Field ◽  
Memory Effects ◽  
Isotropic Phase ◽  
Zero Temperature ◽  
Microscopic Approach ◽  
Random Anisotropy ◽  
Orientational Ordering ◽  
2D And 3D

We study the influence of external electric or magnetic field B on orientational ordering of nematic liquid crystals or of other rod-like objects (e.g. nanotubes immersed in a liquid) in the presence of random anisotropy field type of disorder. The Lebwohl–Lasher lattice type of semi-microscopic approach is used at zero temperature. Therefore, results are valid well below the transition into the isotropic phase. We calculate the correlation function of systems as a function of B, concentration p of impurities imposing random anisotropy field disorder, the disorder strength W and system dimensionality (2D and 3D systems). In order to probe memory effects we calculate correlation length ξ for random and homogeneous initial configurations. We determine the crossover fields B c(p) separating roughly the ordered and disordered regime. Memory effects are apparent only in the latter case, i.e. for B < B c. PACS numbers: 47.51.+a, 47.54.-r, 07.05.Tp, 61.30.-v

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