Liquid‐Crystalline Dynamic Networks Doped with Gold Nanorods Showing Enhanced Photocontrol of Actuation,Advanced Materials

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Liquid‐Crystalline Dynamic Networks Doped with Gold Nanorods Showing Enhanced Photocontrol of Actuation
Advanced Materials ( IF 27.4 ) Pub Date : 2018-02-12 , DOI: 10.1002/adma.201706597
Xili Lu _{1,

2} , Hu Zhang ₂ , Guoxia Fei ₁ , Bing Yu ₂ , Xia Tong ₂ , Hesheng Xia ₁ , Yue Zhao ₂

Affiliation

A near‐infrared‐light (NIR)‐ and UV‐light‐responsive polymer nanocomposite is synthesized by doping polymer‐grafted gold nanorods into azobenzene liquid‐crystalline dynamic networks (AuNR‐ALCNs). The effects of the two different photoresponsive mechanisms, i.e., the photochemical reaction of azobenzene and the photothermal effect from the surface plasmon resonance of the AuNRs, are investigated by monitoring both the NIR‐ and UV‐light‐induced contraction forces of the oriented AuNR‐ALCNs. By taking advantage of the material's easy processability, bilayer‐structured actuators can be fabricated to display photocontrollable bending/unbending directions, as well as localized actuations through programmed alignment of azobenzene mesogens in selected regions. Versatile and complex motions enabled by the enhanced photocontrol of actuation are demonstrated, including plastic “athletes” that can execute light‐controlled push‐ups or sit‐ups, and a light‐driven caterpillar‐inspired walker that can crawl forward on a ratcheted substrate at a speed of about 13 mm min^‐1. Moreover, the photomechanical effects arising from the two types of light‐triggered molecular motion, i.e., the trans–cis photoisomerization and a liquid‐crystalline–isotropic phase transition of the azobenzene mesogens, are added up to design a polymer “crane” that is capable of performing light‐controlled, robot‐like, concerted macroscopic motions including grasping, lifting up, lowering down, and releasing an object.

中文翻译：

掺杂金纳米棒的液晶动态网络显示出增强的光致控制

通过将接枝了聚合物的金纳米棒掺入偶氮苯液晶动态网络（AuNR-ALCN）中，可以合成出近红外（NIR）和紫外光响应的聚合物纳米复合材料。通过监测NIR和紫外光诱导的定向AuNR-的收缩力，研究了两种不同的光响应机理的影响，即偶氮苯的光化学反应和AuNRs的表面等离振子共振的光热效应。 ALCN。通过利用这种材料的易加工性，可以制造双层结构的执行器以显示光控弯曲/未弯曲方向，以及通过在选定区域中对偶氮苯液晶元进行程序排列来实现局部驱动。^‐1。此外，由光触发的分子运动的两种类型产生的光机械效应，即偶氮苯介晶的反式-顺式光异构化和液晶-各向同性相变，共同设计了一种聚合物“起重机”，即能够执行光控，类似机器人的协调一致的宏观运动，包括抓紧，抬起，放下和释放物体。

更新日期：2018-02-12

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