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Title
Japanese: 
English:Design of discotic liquid crystal enabling complete switching between and memory of two alignment states over a large area 
Author
Japanese: 庄子 良晃, 小林 美貴, 小阪 敦子, R. Haruki, R. Kumai, S. Adachi, 梶谷 孝, 福島 孝典.  
English: Y. Shoji, M. Kobayashi, A. Kosaka, R. Haruki, R. Kumai, S. Adachi, T. Kajitani, T. Fukushima.  
Language English 
Journal/Book name
Japanese: 
English:Chemical Science 
Volume, Number, Page Vol. 13    Issue 34    Page 9891-9901
Published date July 19, 2022 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://pubs.rsc.org/en/content/articlelanding/2022/sc/d2sc03677k
 
DOI https://doi.org/10.1039/D2SC03677K
Abstract The alignment control of discotic columnar liquid crystals (LCs), featuring a low motility of the constituent molecules and thus having a large viscosity, is a challenging task. Here we show that triphenylene hexacarboxylic ester, when functionalized with hybrid side chains consisting of alkyl and perfluoroalkyl groups in an appropriate ratio, gives a hexagonal columnar (Colh) LC capable of selectively forming large-area uniform homeotropic or homogeneous alignments, upon cooling from its isotropic melt or upon application of a shear force at its LC temperature, respectively. In addition to the alignment switching ability, each alignment state remains persistent unless the LC is heated to its melting temperature. In situ X-ray diffraction analysis under the application of a shear force, together with polarized optical microscopy observations, revealed how the columnar assembly is changed during the alignment-switching process. The remarkable behavior of the discotic LC is discussed in terms of its rheological properties.

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