NDLI: Homogeneous and homeotropic alignment of bent-core uniaxial and biaxial nematic liquid crystals

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Homogeneous and homeotropic alignment of bent-core uniaxial and biaxial nematic liquid crystals

Content Provider	Royal Society of Chemistry (RSC)
Author	Kang, Shin-Woong Yoon, HyungGuen Srinivasarao, Mohan Lehmann, Matthias Kumar, Satyendra Park, Jung Ok
Copyright Year	2011
Abstract	The effect of well-established homeotropically and homogeneously aligning polyimides, developed for calamitic liquid crystals, on the alignment of the nematic phases of bent-core mesogens was investigated using polarizing optical microscopy and conoscopy. Two polyimides, the homogeneously aligning SE7792 and the homeotropically aligning S659, were used to align three bent-core mesogens. Two of the mesogens, with an azo group in one of their arms, are found to align in a manner similar to the calamitic mesogens, while a fluorenone core based mesogen counter-intuitively aligns homogeneously on S659 coated surface and homeotropically on SE7792. Attractive interactions between unidirectionally oriented polyimide side-chains and the alkyl chains of mesogens determine the direction of alignment of the nematic director.
Starting Page	8770
Ending Page	8775
Page Count	6
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	7
Issue Number	19
Journal	Soft Matter
DOI	10.1039/c1sm05653k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Azo compound Polyimide Liquid crystal Optical microscope Fluorenone Conoscopy Mesogen
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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