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Caterpillar‐Inspired Design and Fabrication of A Self‐Walking Actuator with Anisotropy, Gradient, and Instant Response
Author(s) -
Li Bin,
Du Tao,
Yu Bo,
van der Gucht Jasper,
Zhou Feng
Publication year - 2015
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201500577
Subject(s) - materials science , actuator , elastomer , bilayer , anisotropy , nanotechnology , composite material , optics , physics , membrane , biology , electrical engineering , genetics , engineering
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.