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Article
Homogeneous and Homeotropic Alignment of Bent-Core Uniaxial and Biaxial Nematic Liquid Crystals
Soft Matter
  • HyungGuen Yoon, Kent State University - Kent Campus
  • Shin-Woong Kang, Kent State University - Kent Campus
  • Matthias Lehmann
  • Jung Ok Park
  • Mohan Srinivasarao
  • Satyendra Kumar, Kent State University - Kent Campus
Publication Date
1-1-2011
Document Type
Article
DOI
10.1039/c1sm05653k
Keywords
  • Raman Scattering,
  • Phases,
  • Order,
  • Mesogens
Disciplines
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.
Comments

Copyright 1992 American Physical Society. Available on publisher's site.

Citation Information
HyungGuen Yoon, Shin-Woong Kang, Matthias Lehmann, Jung Ok Park, et al.. "Homogeneous and Homeotropic Alignment of Bent-Core Uniaxial and Biaxial Nematic Liquid Crystals" Soft Matter Vol. 7 Iss. 19 (2011) p. 8770 - 8775
Available at: http://works.bepress.com/satyendra_kumar/32/