Ferroelectrically Switchable Axial Polarization in Columnar Liquid Crystalline Phases

Recently, ferroelectrically switchable columnar LCs have drawn a great deal of attention for their generation of rich polarization domains. Because of their unique dielectric and self‐assembly properties, they are considered to be a promising material for the design of sensors and ultra‐high memory...

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Bibliographic Details
Published in:Chemistry : a European journal 2020-06, Vol.26 (31), p.6964-6975
Main Authors: Nguyen, Manh Linh, Cho, Byoung‐Ki
Format: Article
Language:English
Subjects:
axial polarization
Chemistry
columnar
Dielectric properties
electric field
Fabrication
ferroelectric
Ferroelectricity
Liquid crystals
Memory devices
Polarization
Triazoles
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Summary:Recently, ferroelectrically switchable columnar LCs have drawn a great deal of attention for their generation of rich polarization domains. Because of their unique dielectric and self‐assembly properties, they are considered to be a promising material for the design of sensors and ultra‐high memory devices. Herein, ferroelectrically switchable LCs by using ester, amide, and 1,2,3‐triazole groups are reviewed. Most of them do not exhibit genuine ferroelectricity owing to the low energy barrier between the two polar states. The intermolecular interactions between polar groups strongly affect the switchability and stability of polarization. Therefore, it is challenging to balance these two competing factors to improve the ferroelectric function in columnar LCs. Overall, additional effort, including LC design and device fabrication, should be made to optimize the material performance for practical applications in the future. Up and down: The axial polarization formed by the one‐dimensional stacking of polar groups can be ferroelectrically switched in response to an electric field, if its stability and dynamics are exquisitely balanced. This minireview presents an overview of ferroelectrically switchable columnar liquid crystals in terms of polar group design.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201904884