Charge Density Waves in Solids by G. Hutiray, J. Solyom

By G. Hutiray, J. Solyom

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The thermopolymerization stabilized the photoalignment produced by azo dye layers. 23 for cholesteric and smectic liquid crystals. 22 Different types of nematic liquid crystal alignments [1]. We have already described the planar (homogeneous), homeotropic, and tilted orientations. 22). We should know that it is impossible to create a twisted nematic liquid crystal orientation with a rotation angle more than 90 . Thus, a certain amount of a chiral dopant has to be added to provide the necessary twist angle of the nematic configuration (180 or 270 is most suitable for applications).

24, curve 2). 38) proves to be sufficient for the adequate description of the experimental phenomena [15]. 38) is also shown (curve 3). In any case, once the form W(q) is chosen, the problem of searching the director field in a layer of a finite thickness can be solved at the macroscopic level by solving the variation problem of the minimization of a total value of the liquid crystal bulk and surface energy [1, 2]. More detail description of the methods for the determination of the liquid crystal anchoring energy will be provided in Chapter 5.

2008) Nanostructured liquid crystal alignment layers. J. Soc. Inform. Display, 16, 911. S. (2007) Variable liquid crystal pretilt angles generated by photoalignment of a mixed polyimide alignment layer. Appl. Phys. , 90, 243506. -M. (2004) Application of photoalignment technologies to antiferroelectric liquid crystal cell. Mol. Cryst. Liq. , 412, 369. , and Durand, G. (1984) Anchoring energy of nematic liquid crystals: an analysis of the proposed forms. Z. , 39, 1066. G. (1983) Investigation of NLC director orientational deformations in electric field for different boundary conditions.

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