School of Chemistry and Chemical Engineering, Jiangsu Province Hi-Tech Key Laboratory for Bio-medical Research, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, State Key Laboratory of Bioelectronics, Southeast University, Nanjing, Jiangsu Province 211189, China.
Nat Commun. 2016 Dec 22;7:13981. doi: 10.1038/ncomms13981.
In nature, plant tendrils can produce two fundamental motion modes, bending and chiral twisting (helical curling) distortions, under the stimuli of sunlight, humidity, wetting or other atmospheric conditions. To date, many artificial plant-like mechanical machines have been developed. Although some previously reported materials could realize bending or chiral twisting through tailoring the samples into various ribbons along different orientations, each single ribbon could execute only one deformation mode. The challenging task is how to endow one individual plant tendril mimic material with two different, fully tunable and reversible motion modes (bending and chiral twisting). Here we show a dual-layer, dual-composition polysiloxane-based liquid crystal soft actuator strategy to synthesize a plant tendril mimic material capable of performing two different three-dimensional reversible transformations (bending versus chiral twisting) through modulation of the wavelength band of light stimuli (ultraviolet versus near-infrared). This material has broad application prospects in biomimetic control devices.
在自然界中，植物卷须在阳光、湿度、润湿或其他大气条件的刺激下，可以产生两种基本的运动模式，即弯曲和手性扭曲（螺旋卷曲）变形。迄今为止，已经开发出许多类似植物的人工机械机器。尽管以前报道的一些材料可以通过将样品沿着不同的方向制成各种带状来实现弯曲或手性扭曲，但每个单独的带状只能执行一种变形模式。具有挑战性的任务是如何赋予单个植物卷须模拟材料两种不同的、完全可调且可逆的运动模式（弯曲和手性扭曲）。在这里，我们展示了一种双层、双组分聚硅氧烷基液晶软驱动器策略，通过调节光刺激的波长带（紫外线与近红外光），来合成一种能够执行两种不同的三维可逆变形（弯曲与手性扭曲）的植物卷须模拟材料。这种材料在仿生控制装置中有广阔的应用前景。
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