Caterpillar-Inspired Design and Fabrication of A Self-Walking Actuator with Anisotropy, Gradient, and Instant Response

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Bin LiFeng Zhou

Abstract

A caterpillar-mimetic bilayer actuator is reported, based on a wrinkled polydimethylsiloxane elastomer decorated with a hydroresponsive polyelectrolyte brush. The actuator can fold ultrafast into complex three-dimensional structures upon a change in relative humidity of the surrounding air. The folding direction is determined by the geometry of the actuator, the orientation of the wrinkles, and the gradient in polymer height on the surface. And some unique structures such as helicoid and gradient can be obtained that are seldom reported in the case of bilayered devices. The adaptive bending movement is very fast, anisotropic, highly efficient, and reversible. When the environmental humidity is repeatedly cycled up and down, the small device walks on a surface with a roughness gradient, which is reminiscent of the muscle-like movements.

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Citations

Mar 24, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Pengyu ZhuangAlain M Jonas
Oct 27, 2016·Chemical Society Reviews·Minxuan KuangLei Jiang
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Apr 8, 2020·Proceedings of the National Academy of Sciences of the United States of America·Ze ZhaoNam-Joon Cho
May 4, 2021·Small·Keumbee KimSuk-Kyun Ahn
May 15, 2021·Journal of the American Chemical Society·Mingfang YangZhenjie Zhang
Apr 25, 2020·Nano-micro Letters·Yinlong TanWenjian Wu
Jan 1, 2021·ACS Applied Materials & Interfaces·Zhongjian ZhangShufen Zhang
Sep 6, 2019·ACS Applied Materials & Interfaces·Yangyang XiangFeng Zhou
May 16, 2019·ACS Applied Materials & Interfaces·Qing ChenMingming Ma

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