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Issue 19, 2011
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Homogeneous and homeotropic alignment of bent-core uniaxial and biaxial nematic liquid crystals

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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.

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

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Publication details

The article was received on 13 Apr 2011, accepted on 23 Jun 2011 and first published on 11 Aug 2011


Article type: Paper
DOI: 10.1039/C1SM05653K
Citation: Soft Matter, 2011,7, 8770-8775
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    Homogeneous and homeotropic alignment of bent-core uniaxial and biaxial nematic liquid crystals

    H. Yoon, S. Kang, M. Lehmann, J. O. Park, M. Srinivasarao and S. Kumar, Soft Matter, 2011, 7, 8770
    DOI: 10.1039/C1SM05653K

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