Alignment defects

At room temperature, the alignment defect is about 15 . Nevertheless the distortion remains sufficiently weak so as not too much have modifying effect on the interatomic distances. Although in theory the lattice is monoclinic, practically the arrangement is cubic. 

The maximum scattering occurs at some resonance values of the wavevector q = m l qc. In fact, hght propagating along z probes different q modes with the number m. However, in comparison with nematics, well aligned, defect-free SmA liquid crystals are weakly scattering. 

Spacer beads are sprayed on the substrate to make the cell gap uniform, and they C in cause alignment defects in the LC because of their surface alignment strength and movement. Recently, the density of spacer beads has tended to increase in order to produce lightweight panels with thinner glass substrates. 

Ferroelectric liquid crystal devices have suffered from a number of characteristic alignment defects which are absent from nematic liquid crystal devices. The most important of these, termed zig-zag defects (from their characteristic shape) result from the chevron structure (Fig. 23). The chevron can form with the layer tilt toward either of the directions perpendicular to the layer planes if there is also a surface pretilt, its direction and that of the layer tilt may... 

XRD samples 638 f alignment defects, displays 756 alignment materials, displays 732 aliphatic chains 125,395 alkanes, solvents 883 alkanoic acids, esterification alkanols, esterification 106 alkenes, solvents 883 alkenyl, terminal substituents alkyl functionalization, arenes alkyl groups... 

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