scholarly journals Surface Alignment and Anchoring Transitions in Nematic Lyotropic Chromonic Liquid Crystal

2010 ◽  
Vol 105 (1) ◽  
Author(s):  
V. G. Nazarenko ◽  
O. P. Boiko ◽  
H.-S. Park ◽  
O. M. Brodyn ◽  
M. M. Omelchenko ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Surface Alignment ◽  
Anchoring Transitions

scholarly journals Nematic liquid crystal alignment on subwavelength metal gratings

2018 ◽  
Vol 9 ◽  
pp. 42-47 ◽  
Author(s):  
Irina V Kasyanova ◽  
Artur R Geivandov ◽  
Vladimir V Artemov ◽  
Maxim V Gorkunov ◽  
Serguei P Palto
Keyword(s):  
Liquid Crystal ◽  
Fourier Analysis ◽  
Nematic Liquid Crystal ◽  
Slit Width ◽  
Homogeneous Surface ◽  
Period Ratio ◽  
Transmittance Spectra ◽  
Surface Alignment ◽  
Crystal Alignment ◽  
Metal Gratings

We have studied the alignment of a nematic liquid crystal (LC) material on aluminum subwavelength nanogratings as a function of the period, p, and the slit width to period ratio, w/p. A method, based on Fourier analysis of the transmittance spectra of the LC grating system, has been applied. We show that the gratings provide stable planar alignment only for shorter periods and narrower slits (p < 400 nm, w/p < 2/3). As these parameters increase, the homogeneous surface alignment changes to domains with different tilt angles or to spatially modulated alignment. We have also obtained a 90° twisted LC director distribution, implying sufficiently strong azimuthal LC anchoring at the grating surface.

scholarly journals Domain walls and anchoring transitions mimicking nematic biaxiality in the oxadiazole bent-core liquid crystal C7

Soft Matter ◽  
2015 ◽  
Vol 11 (20) ◽  
pp. 3963-3970 ◽  
Author(s):  
Young-Ki Kim ◽  
Greta Cukrov ◽  
Jie Xiang ◽  
Sung-Tae Shin ◽  
Oleg D. Lavrentovich
Keyword(s):  
Liquid Crystal ◽  
Nematic Phase ◽  
Domain Walls ◽  
Anchoring Transitions ◽  
Biaxial Nematic ◽  
Biaxial Nematic Phase

“Secondary disclinations” previously considered as evidence of a biaxial nematic phase are shown to be domain walls in a uniaxial nematic phase.

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