Development of ferroelectric nematic fluids with giant-ε dielectricity and nonlinear optical properties.
Development of ferroelectric nematic fluids with giant-ε dielectricity and nonlinear optical properties.
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DOI：
10.1126/sciadv.abf5047
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发表时间：
2021-04
期刊：
影响因子：
13.6
通讯作者：
Aya S
中科院分区：
文献类型：
--
作者：
Li J;Nishikawa H;Kougo J;Zhou J;Dai S;Tang W;Zhao X;Hisai Y;Huang M;Aya S
具有足够高偶极矩的珍珠形极性分子能够产生巨型ε铁电向列相。超高ε材料表现出极高的介电常数，被认为是下一代光子和电子器件的潜在候选者。一般来说，实现高ε状态需要较低的材料对称性，因为大多数已知的高ε材料都是对称性破缺的晶体。关于高ε流体介质的研究报道很少。在这里，我们展示了在合理的分子设计和机器学习分析的支持下，具有高极性的小分子如何使具有强二次谐波产生和宏观自发极性有序的超高ε流体材料(介电常数，ε>104)的发展成为可能。所有合成的材料的极性结构都是相同的。此外，将这一策略应用于高分子体系，使我们能够将这种方法推广到极性聚合物材料，创建具有自发对称性破缺的极性软物质。
Pearl-shaped polar molecules with high enough dipole moment enable the creation of the giant-ε ferroelectric nematics. Superhigh-ε materials that exhibit exceptionally high dielectric permittivity are recognized as potential candidates for a wide range of next-generation photonic and electronic devices. In general, achieving a high-ε state requires low material symmetry, as most known high-ε materials are symmetry-broken crystals. There are few reports on fluidic high-ε dielectrics. Here, we demonstrate how small molecules with high polarity, enabled by rational molecular design and machine learning analyses, enable the development of superhigh-ε fluid materials (dielectric permittivity, ε > 104) with strong second harmonic generation and macroscopic spontaneous polar ordering. The polar structures are confirmed to be identical for all the synthesized materials. Furthermore, adapting this strategy to high–molecular weight systems allows us to generalize this approach to polar polymeric materials, creating polar soft matters with spontaneous symmetry breaking.
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