Chemical structure and POM texture of (a) 8CB and (b) triphenoxy at 25 °C. Scale bars correspond to 200 μm.
Various POM textures of the 8CB-triphenoxy mixture in a non-rubbed cell. 1.0 wt. % triphenoxy was mixed with 8CB. (a) and (b) Circular domains, (c) and (d) growing spiral domains, and (e) and (f) 2-dimensional period textures. The cell was located between crossed polarizers. Scale bars correspond to 200 μm except for (e) 100 μm.
POM texture of (a) oppositely twisted helical spiral domains and (b)growing spiral domains between crossed polarizers. 1.0 wt. % triphenoxy doped 8CB was used in the cell. Scale bars correspond to 100 μm. The pitch of the helix is about 25 μm.
POM texture of the bent-broom domains between crossed polarizers. Note that two domains are not superimposable. The insets represent the magnified image of the broom-shaped domains. The bottom right broom-shaped domain was rotated 180° in the inset. 1.0 wt. % triphenoxy doped 8CB was used in the cell. Scale bars correspond to 100 μm.
WAXS data of pure 8CB, triphenoxy, and 8CB-triphenoxy mixtures in (a) small angle and (b) wide angle regions at 25 °C.
Schematic illustration of (a) splay and (b) bend orientation of the 8CB-triphenoxy mixture in circular domains.
Postulated twist conformation of triphenoxy molecule. Twisted triphenoxy molecule is non-superimposable with its mirror image.
POM texture of the (a) 0.5 wt. %, (b) 2.5 wt. %, and (c) 5.0 wt. % triphenoxy doped 8CB cells. Scale bars correspond to 200 μm.
POM texture of the 1.0 wt. % triphenoxy mixture cell in the rubbed planar cell at (a) 0 V, (b) +20 V, and (c) +40 V state. Arrow represents the rubbing direction of the cell. The polarizing direction of the incident light was at 45° to the rubbing direction. Scale bars correspond to 500 μm.
Transmittance of the 1.0 wt. % triphenoxy doped 8CB cell vs rotation angle of crossed polarizers.
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