Gyrification-Inspired Highly Convoluted Graphene Oxide Patterns for Ultralarge Deforming Actuators
Gyrification-Inspired Highly Convoluted Graphene Oxide Patterns for Ultralarge Deforming Actuators
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用于超大型变形执行器的旋回启发的高度卷积氧化石墨烯图案
DOI：
10.1021/acsnano.7b01937
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发表时间：
2017
期刊：
影响因子：
17.1
通讯作者：
Song Jia
中科院分区：
文献类型：
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作者：
Tan Yinlong;Chu Zengyong;Jiang Zhenhua;Hu Tianjiao;Li Gongyi;Song Jia
人脑中的回旋是由皮质层的切向膨胀引起的压缩应力驱动的，而类似的形貌也可以由球形基底的切向收缩引起。在这里，我们介绍了一种简单的三维（3D）收缩方法，使用二维（2D）氧化石墨烯（GO）作为构建块来生成皮质样图案。通过在充气乳胶球上旋转浸渍涂覆GO膜，然后缓慢释放空气，可以诱导高度折叠的疏水GO表面。观察到起皱到折叠的转变，并且通过改变衬底的预应变和GO膜的厚度可以容易地调节折叠状态。在系统中储存的残余应力的驱动下，一旦双层系统被切割成切片，板到管的致动就迅速发生。然而，在响应于一些有机溶剂时，方形双层致动器在润湿和干燥时表现出优异的可逆、双向、大变形卷曲特性。在四氢呋喃（THF）的作用下，从初始负弯曲到最终正弯曲的18 s内，观察到了2.75 mm-1的超大曲率。除了机械手，游泳蠕虫，智能包装，仿生含羞草，和两个仿生花，原油收集器已被设计和演示，由超疏水和超亲油改性GO表面和溶剂响应双层系统的帮助。
Gyrification in the human brain is driven by the compressive stress induced by the tangential expansion of the cortical layer, while similar topographies can also be induced by the tangential shrinkage of the spherical substrate. Herein we introduce a simple three-dimensional (3D) shrinking method to generate the cortex-like patterns using two-dimensional (2D) graphene oxide (GO) as the building blocks. By rotation-dip-coating a GO film on an air-charged latex balloon and then releasing the air slowly, a highly folded hydrophobic GO surface can be induced. Wrinkling-to-folding transition was observed and the folding state can be easily regulated by varying the prestrain of the substrate and the thickness of the GO film. Driven by the residue stresses stored in the system, sheet-to-tube actuating occurs rapidly once the bilayer system is cut into slices. In response to some organic solvents, however, the square bilayer actuator exhibits excellent reversible, bidirectional, large-deformational curling properties on wetting and drying. An ultralarge curvature of 2.75 mm–1was observed within 18 s from the original negative bending to the final positive bending in response to tetrahydrofuran (THF). In addition to a mechanical hand, a swimming worm, a smart package, a bionic mimosa, and two bionic flowers, a crude oil collector has been designed and demonstrated, aided by the superhydrophobic and superoleophilic modified GO surface and the solvent-responsive bilayer system.