Validation of the Orientation Procedure

FIGURE 2.6 Experimental setup (a) source, (b) polarizer, (c) KBr pellets, (d) nematic liquid crystal suspension, (e) analyzer, and (f) microscope. 

The role of the crystal class on the degree of orientation was examined by studying the three compounds with polymorph modihcations. In all cases the monoclinic 

FIGURE 2.7 3D graph with the dependence of the parameter A versus particle size (pm), the velocity of the slippage (pm/s), and the layer thickness of the suspension of DL-isoleucine in the nematic liquid crystals ZLI-1695, MLC-6815, and ZLI-1538. (See color insert.) 

Like in all of the previously described systems, 5-amino-2-methoxypyridine ester amide of squaric acid ethyl ester with a monoclinic space group shows an 

FIGURE 2.8 Hydrogen bonding in a crystal of 5-amino-2-methoxypyridine ester amide of squaric acid ethyl ester. (Koleva, B., T. Kolev, V. Simeonov, T. Spassov, and M. Spiteller. 2008, J. Incl. Phen, 61 319-333. With permission.) 

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