Ferroelectric Columnar Liquid Crystal Featuring Confined Polar Groups Within Core-Shell Architecture
Ferroelectric Columnar Liquid Crystal Featuring Confined Polar Groups Within Core-Shell Architecture
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DOI：
10.1126/science.1217954
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发表时间：
2012-04-13
期刊：
影响因子：
56.9
通讯作者：
Aida, Takuzo
中科院分区：
文献类型：
--
作者：
Miyajima, Daigo;Araoka, Fumito;Aida, Takuzo
铁电液晶是具有残余和电可逆极性顺序的材料。如果电极化沿沿着柱状轴发生，则具有铁电性质的柱状液晶在超高密度存储器件中具有潜在用途。然而，在零电场下具有轴向非零极化的柱状液晶及其电可逆性尚未得到证实。在这里，我们报告了一个柱状液晶的铁电响应，采用核壳结构，可容纳一个阵列的极性氰基限制的氢键酰胺网络具有最佳的强度。在外加电场下，柱和核心氰基都单向排列，从而产生极大的宏观剩余极化。
Ferroelectric liquid crystals are materials that have a remnant and electrically invertible polar order. Columnar liquid crystals with a ferroelectric nature have potential use in ultrahigh-density memory devices, if electrical polarization occurs along the columnar axis. However, columnar liquid crystals having an axial nonzero polarization at zero electric field and its electrical invertibility have not been demonstrated. Here, we report a ferroelectric response for a columnar liquid crystal adopting a core-shell architecture that accommodates an array of polar cyano groups confined by a hydrogen-bonded amide network with an optimal strength. Under an applied electric field, both columns and core cyano groups align unidirectionally, thereby developing an extremely large macroscopic remnant polarization.