scholarly journals Pretilt Angle of Liquid Crystals and Liquid-Crystal Alignment on Microgrooved Polyimide Surfaces Fabricated by Soft Embossing Method

Langmuir ◽  
2006 ◽  
Vol 22 (22) ◽  
pp. 9403-9408 ◽  
Author(s):  
Da-Ren Chiou ◽  
Li-Jen Chen ◽  
Chein-Dhau Lee
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Liquid Crystal Alignment ◽  
Crystal Alignment ◽  
Pretilt Angle

Liquid crystal alignment in cylindrical microcapillaries

2012 ◽  
Vol 20 (1) ◽  
Author(s):  
M. Chychłowski ◽  
O. Yaroshchuk ◽  
R. Kravchuk ◽  
T. Woliński
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Photonic Crystal ◽  
Boundary Conditions ◽  
Photonic Crystal Fibers ◽  
Optical Devices ◽  
Liquid Crystal Alignment ◽  
Disclination Line ◽  
Crystal Alignment ◽  
Crystal Fibers

AbstractA variety of alignment configurations of liquid crystals (LCs) inside the glassy cylindrical capillaries is realized by using alignment materials providing different anchoring. The radial configuration with central disclination line is obtained for homeotropic boundary conditions. In turn, the axial, transversal and tilted alignment structures are realized by using materials for planar anchoring. The uniformity and controlling of the latter structures were provided by photoalignment method. This approach can be further used to control LC alignment in the photonic crystal fibers recognized as advanced elements for different optical devices.

scholarly journals Anchoring energy enhancement and pretilt angle control of liquid crystal alignment on polymerized surfaces

AIP Advances ◽  
2015 ◽  
Vol 5 (9) ◽  
pp. 097218 ◽  
Author(s):  
Libo Weng ◽  
Pei-Chun Liao ◽  
Chen-Chun Lin ◽  
Tien-Lun Ting ◽  
Wen-Hao Hsu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Alignment ◽  
Anchoring Energy ◽  
Crystal Alignment ◽  
Pretilt Angle

Dependence of pretilt angle on the topography of substrate in liquid crystal alignment brought about by rubbing technique

1994 ◽  
Vol 64 (9) ◽  
pp. 1103-1104 ◽  
Author(s):  
Hitoshi Hatoh ◽  
Takeshi Yamamoto ◽  
Yasue Morizumi ◽  
Masumi Okamoto ◽  
Akira Kubo
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Alignment ◽  
Crystal Alignment ◽  
Pretilt Angle

Aging of Liquid Crystal Alignment on Plasma Beam Treated Substrates: Choice of Alignment Materials and Liquid Crystals

2007 ◽  
Vol 479 (1) ◽  
pp. 111/[1149]-120/[1158] ◽  
Author(s):  
O. Yaroshchuk ◽  
R. Kravchuk ◽  
L. Dolgov ◽  
A. Dobrovolskyy ◽  
N. Klyui ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Plasma Beam ◽  
Liquid Crystal Alignment ◽  
Crystal Alignment

Mechanisms Of Liquid Crystal Alignment On Buffed Polyimide Surfaces

1994 ◽  
Vol 345 ◽  
Author(s):  
Hirotsugu Kikuchi ◽  
J. A. Logan ◽  
Do Y. Yoon
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Amic Acid ◽  
Polymer Chains ◽  
Polymer Surfaces ◽  
Polyimide Films ◽  
Force Microscopy ◽  
Liquid Crystal Alignment ◽  
Smectic C ◽  
Crystal Alignment

AbstractThe surfaces of poly(amic acid) and cured polyimide films, subjected to different buffing and cure profiles, have been examined by atomic force microscopy (AFM). The ability of these buffed polymer surfaces to align nematic and chiral smectic C liquid crystals were also investigated. These studies show that the presence of microgrooves on buffed polymer surfaces are not necessary for alignment of liquid crystals. Rather, it is concluded that the liquid crystal alignment is mainly caused by the anisotropic intermolecular interactions between liquid crystal molecules and the polymer chains oriented by buffing. For the alignment of smectics, both the degree of order and mechanical properties of polyimide films are found to be important factors.

Anisotropic Reflectivity of Rubbed Polyimide Liquid Crystal Alignment Layer

2010 ◽  
Vol 428-429 ◽  
pp. 309-316
Author(s):  
Wen Jun Zheng
Keyword(s):  
Liquid Crystal ◽  
Optical Anisotropy ◽  
Polyimide Films ◽  
Alignment Layer ◽  
Liquid Crystal Alignment ◽  
Surface Optical ◽  
Crystal Alignment ◽  
Pretilt Angle

The surface optical anisotropy of rubbed polyimide films has been detected using reflection anisotropy spectroscopy. The amplitude of the reflection anisotropy signals increases with the rubbing strength. Rubbing also causes changes in pretilt angle of liquid crystal molecules which are in contact with the rubbed polyimide. An increase in rubbing strength results in an increase in the pretilt angel. The pretilt of the liquid crystal molecules was found to linearly correlate with the amplitude of the RA signals.

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