Journal
ACS APPLIED NANO MATERIALS
Volume 6, Issue 12, Pages 10531-10538Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.3c01508
Keywords
columnar liquid crystal; ferroelectricity; electroresponsive material; memory device; supramolecule; polarization switching; helical structure
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Axially polar-ferroelectric columnar liquid crystals (AP-FCLCs) are composed of nanosized axially polarized columnar molecular aggregates that can switch their polar directions and maintain them after removing the electric field. We designed a urea compound with specific groups to achieve a smooth phase transition from AP-FCLC phase to crystal phase without disturbing the induced polar structure. The resulting AP-FCLC compound successfully transitions from the FCLC phase to the crystal phase at room temperature while maintaining the induced polarization, enabling long-term maintenance of polarization information.
Axially polar-ferroelectric columnar liquid crystals(AP-FCLCs)consist of nanosized axially polarized columnar molecular aggregatesarranged in parallel, in which their polar directions can be switchedby applying an electric field and maintained after removal of theelectric field. However, the problem remains that the induced polaritycan be disturbed by external stimuli because liquid crystals are fluid.To solve this problem, we planned to realize a smooth phase transitionsystem from an AP-FCLC phase to a crystal phase without disturbingthe induced polar structure. Thus, we designed a urea compound withtwo biphenyl groups and four 2-butyloctyl groups to achieve the system.As a result, we succeeded in realizing an AP-FCLC compound that transitionsfrom the FCLC phase to the crystal phase at room temperature whilemaintaining the polarization induced in the FCLC phase, which is expectedto enable long-term maintenance of polarization information.
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