Control of periodic defect arrays of 8CB (4 '-n-octyl-4-cyano-biphenyl) liquid crystals by multi-directional rubbing

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In this study, we introduce a simple multi-directional rubbing method to generate various periodic patterns of toric focal conic domains (TFCDs), a typical smectic (Sm) LC defect by using the commonly used Sm LC materials, 4'-n-octyl-4-cyano-biphenyl (8CB). We have successfully obtained a variety of spatially arranged TFCD arrays such as parallelogrammic, hexagonal and square arrays by changing the rubbing angle (Omega) between two different rubbing directions. Our experimental results demonstrate that frustration and distortion of nematic LC molecules at the intersections act as effective seeds to help positioning of TFCDs. Furthermore, the existence of nematic-Smectic A (SmA) phase transition is quite important in controlling the arrangement of TFCDs as the alignment of the nematic director strongly influences the arrangement of TFCDs formed in the SmA phase.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2013
Language
English
Article Type
Article
Keywords

FOCAL CONIC DOMAINS; BLOCK-COPOLYMERS; ORDERED PATTERNS; PRETILT ANGLE; ALIGNMENT; SURFACE; FILMS; GRAPHOEPITAXY; LITHOGRAPHY; FABRICATION

Citation

SOFT MATTER, v.9, no.42, pp.10135 - 10140

ISSN
1744-683X
DOI
10.1039/c3sm52008k
URI
http://hdl.handle.net/10203/188572
Appears in Collection
CBE-Journal Papers(저널논문)
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