Frequency-Driven Self-Organized Helical Superstructures Loaded with Mesogen-Grafted Silica Nanoparticles.
Frequency-Driven Self-Organized Helical Superstructures Loaded with Mesogen-Grafted Silica Nanoparticles.
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DOI：
10.1002/anie.201606895
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发表时间：
2016-10-10
期刊：
影响因子：
--
通讯作者：
Li Q
中科院分区：
文献类型：
--
作者：
Gutierrez-Cuevas KG;Wang L;Zheng ZG;Bisoyi HK;Li G;Tan LS;Vaia RA;Li Q
将胶体纳米粒子添加到液晶介质中已成为一种有前途的途径，无论是增强还是引入新的特性以提高器件性能。在此，我们设计并合成了新的胶体杂化二氧化硅纳米粒子，其表面用介晶单层钝化，以促进它们在液晶主体中的有机溶解性和相容性。通过1H核磁共振、透射电子显微镜、热重分析和紫外 - 可见光谱技术对所得纳米粒子进行了鉴定，并将杂化纳米粒子掺杂到双频胆甾型液晶主体中，以评估它们与主体的相容性以及掺杂浓度对其电光特性的影响。有趣的是，发现掺杂二氧化硅纳米粒子的液晶纳米复合材料能够动态自组织成螺旋结构并表现出多稳定性，即垂直取向（透明）、焦锥（不透明）和平板状态（部分透明），这取决于在持续低电压下施加的频率。值得注意的是，在嵌入纳米粒子的液晶系统中，透明态和散射态之间实现了更高的对比度。
通过将新型介晶接枝的二氧化硅纳米粒子掺入双频胆甾型液晶主体中，制备了频率驱动的自组织螺旋超结构。所得纳米复合材料能够根据在持续低电压下施加的频率呈现多种稳定状态，即透明、不透明和部分透明。这项工作为开发动态功能软材料提供了动力，这些材料可能用于多种器件应用，如智能窗户。
Adding colloidal nanoparticles into liquid crystal media has become a promising pathway either to enhance or to introduce novel properties for improved device performance. Here we designed and synthesized new colloidal hybrid silica nanoparticles passivated with a mesogenic monolayer on the surface to facilitate their organo-solubility and compatibility in liquid crystal host. The resulting nanoparticles were identified by 1H NMR, TEM, TGA and UV-Vis techniques, and the hybrid nanoparticles were doped into a dual frequency cholesteric liquid crystal host to appraise both their compatibility with the host and the effect of the doping concentration on their electro-optical properties. Interestingly, the silica nanoparticle doped liquid crystalline nanocomposites were found to be able to dynamically self-organize into a helical configuration and exhibit multi-stability, i.e., homeotropic (transparent), focal conic (opaque) and planar states (partially transparent), depending on the frequency applied at sustained low voltage. Significantly, a higher contrast ratio between the transparent state and scattering state was accomplished in the nanoparticle-embedded liquid crystal systems. Frequency-driven self-organized helical superstructures are fabricated by incorporating novel mesogen-grafted silica nanoparticles into a dual frequency cholesteric liquid crystal host. The resultant nanocomposites were able to exhibit multiple stable states, i.e., transparent, opaque, and partially transparent, depending on the frequency applied at sustained low voltage. This work offers an impetus in developing dynamic functional soft materials potentially for diverse device applications such as smart windows.
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影响因子：
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