1. Open Access Kent State
  2. Homogeneous and Homeotropic Alignment of Bent-Core Uniaxial and Biaxial Nematic Liquid Crystals
Author(s)
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.
Format
Article
Identifier(s)
10.1039/c1sm05653k
Publication Date
2011-01-01
Publication Title
Soft Matter
Volume
7
Issue
19
First Page
8770
Last Page
8775
Keywords
Subject
Community
Department of Physics
Comments

Copyright 1992 American Physical Society. Available on publisher's site.
Permalink https://oaks.kent.edu/phypubs/36
Yoon, H., Kang, S.-W., Lehmann, M., Park, J., Srinivasarao, M., & Kumar, S. (2011). Homogeneous and Homeotropic Alignment of Bent-Core Uniaxial and Biaxial Nematic Liquid Crystals. Soft Matter. https://doi.org/10.1039/c1sm05653k
Yoon, Hyung, Shin-Woong Kang, Matthias Lehmann, Jung Park, Mohan Srinivasarao, and Satyendra Kumar. 2011. “Homogeneous and Homeotropic Alignment of Bent-Core Uniaxial and Biaxial Nematic Liquid Crystals”. Soft Matter. https://doi.org/10.1039/c1sm05653k.
Yoon, H., S.-W. Kang, M. Lehmann, J. Park, M. Srinivasarao, and S. Kumar. Homogeneous and Homeotropic Alignment of Bent-Core Uniaxial and Biaxial Nematic Liquid Crystals. Soft Matter, 1 Jan. 2011, doi:10.1039/c1sm05653k.