Wettability-Controlled Directional Actuating Strategy Based on Bilayer Photonic Crystals.
Wettability-Controlled Directional Actuating Strategy Based on Bilayer Photonic Crystals.
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DOI：
10.1021/acsami.0c19313
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发表时间：
2020-12
影响因子：
9.5
通讯作者：
Zhongjian Zhang;Yong Qi;Wei Ma;Shufen Zhang
中科院分区：
文献类型：
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作者：
Zhongjian Zhang;Yong Qi;Wei Ma;Shufen Zhang
尽管水引发的双层膜弯曲行为受到广泛关注，但关于具有可见颜色变化的润湿性控制定向致动器的报道很少。以光子晶体为载体，利用亲水性差异制备了双层定向弯曲结构颜色致动器。顶反蛋白石具有较强的亲水性，能促进水渗透，增强溶胀效果。底反蛋白石亲水性弱，能抑制水渗透，减弱溶胀作用。当双层结构浸入水中时，其润湿性的差异会产生不同的可视化光学响应，并带来不同的膨胀性能，导致定向弯曲。浸润差异表现为结构色红移或透明。设计的机理涉及周期纳米结构的光学衍射，表面润湿性和膨胀率的差异，利用水的渗透和毛细蒸发实现反射率的光谱多样性，以及梯度渗透增强弯曲。本工作深入分析了光子晶体结构对润湿性控制致动器光学性能和弯曲性能的改善，为仿生元件的设计提供了基本模型，为双层光子晶体与致动器的结合开辟了思路。
Although the water-triggered bending behavior of bilayer films has been a wide concerned, there are few reports on wettability-controlled directional actuators with visible color changes. Using photonic crystals as carriers, bilayer directional bending structural color actuators were prepared based on the hydrophilic difference. Top inverse opal with strong hydrophilicity can promote water penetration and strengthen the effect of swelling. While, bottom inverse opal with weak hydrophilicity can inhibit water penetration and weaken the effect of swelling. When the bilayer structure is immersed in water, its wettability differences will produce different optical responses for visualization and will bring different swelling performances, resulting in directional bending. Infiltration differences are visualized as structural color red shifts or transparency. The mechanism of the design involves optical diffractions in the fabricated periodic nanostructures, differences in the surface wettability and swelling rate, uses the infiltration and capillary evaporation of water to realize the spectral diversity of reflectance, and the enhancement of bending by gradient infiltration. This work deeply analyzes the improvement of the photonic crystal structure on the optical and bending performance of the wettability-controlled actuator, provides a basic model for the design of bionic components, and opens an idea for the combination of bilayer photonic crystals and actuators.