High-Power Actuation from Molecular Photoswitches in Enantiomerically Paired Soft Springs.
High-Power Actuation from Molecular Photoswitches in Enantiomerically Paired Soft Springs.
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DOI：
10.1002/anie.201611325
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发表时间：
2017-03-13
期刊：
影响因子：
--
通讯作者：
Katsonis N
中科院分区：
文献类型：
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作者：
Aßhoff SJ;Lancia F;Iamsaard S;Matt B;Kudernac T;Fletcher SP;Katsonis N
植物的运动通常依赖于动态螺旋系统，如卷曲卷须，spasmoneme弹簧和手性豆荚的打开。开发纳米技术，使分子水平的现象在人工系统中驱动这种运动仍然是一个科学挑战。在这里，我们描述了一个软设备，使用纳米级的信息来模仿豆荚开口。该系统利用了植物中刺激响应变形的基本机制，即具有特定方向的非柔性元件被集成到刺激响应矩阵中。该装置通过光响应分子开关的异构化来操作，该光响应分子开关驱动液晶弹性体条的扭曲。这些带子向相反的方向扭曲，相互作用，直到豆荚因压力而弹开。这种机制允许分子开关的光致异构化，以刺激宏观尺度的快速形状变化，从而最大限度地提高驱动功率。
Motion in plants often relies on dynamic helical systems as seen in coiling tendrils, spasmoneme springs, and the opening of chiral seedpods. Developing nanotechnology that would allow molecular‐level phenomena to drive such movements in artificial systems remains a scientific challenge. Herein, we describe a soft device that uses nanoscale information to mimic seedpod opening. The system exploits a fundamental mechanism of stimuli‐responsive deformation in plants, namely that inflexible elements with specific orientations are integrated into a stimuli‐responsive matrix. The device is operated by isomerization of a light‐responsive molecular switch that drives the twisting of strips of liquid‐crystal elastomers. The strips twist in opposite directions and work against each other until the pod pops open from stress. This mechanism allows the photoisomerization of molecular switches to stimulate rapid shape changes at the macroscale and thus to maximize actuation power.