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Title
Japanese: 
English:Collective bending motion of a two-dimensionally correlated bowl-stacked columnar liquid crystalline assembly under a shear force 
Author
Japanese: 庄子 良晃, 小宮山 諒, 小林 美貴, 小阪 敦子, 梶谷 孝, R. Haruki, R. Kumai, S. Adachi, T. Tada, N. Karasawa, H. Nakano, H. Nakamura, 櫻井 英博, 福島 孝典.  
English: Y. Shoji, R. Komiyama, M. Kobayashi, A. Kosaka, T. Kajitani, R. Haruki, R. Kumai, S. Adachi, T. Tada, N. Karasawa, H. Nakano, H. Nakamura, H. Sakurai, T. Fukushima.  
Language English 
Journal/Book name
Japanese: 
English:Science Advances 
Volume, Number, Page Vol. 9    Issue 19    eadg8202
Published date May 12, 2023 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://www.science.org/doi/10.1126/sciadv.adg8202
 
DOI https://doi.org/10.1126/sciadv.adg8
Abstract Stacked teacups inspired the idea that columnar assemblies of stacked bowl-shaped molecules may exhibit a unique dynamic behavior, unlike usual assemblies of planar disc– and rod-shaped molecules. On the basis of the molecular design concept for creating higher-order discotic liquid crystals, found in our group, we synthesized a sumanene derivative with octyloxycarbonyl side chains. This molecule forms an ordered hexagonal columnar mesophase, but unexpectedly, the columnar assembly is very soft, similar to sugar syrup. It displays, upon application of a shear force on solid substrates, a flexible bending motion with continuous angle variations of bowl-stacked columns while preserving the two-dimensional hexagonal order. In general, alignment control of higher-order liquid crystals is difficult to achieve due to their high viscosity. The present system that brings together higher structural order and mechanical softness will spark interest in bowl-shaped molecules as a component for developing higher-order liquid crystals with unique mechanical and stimuli-responsive properties.

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