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Research Article | Open Access

Bio-inspired smart surface to achieve controllable locomotion through adjustable anisotropic friction

Zhongying JI1Shiyu QIN2Shuanhong MA1Xin JIA2Xiaolong WANG1( )Feng ZHOU1
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China
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Abstract

Anisotropic friction generated by microstructured surfaces is crucial for performing functions such as directional locomotion and adhesion in biological systems. Hence, an epoxy-based shape memory polymer (SMP) incorporating Fe3O4 nanoparticles is used in this study to create a smart surface with oriented structures to mimic anisotropic friction and exploit human-developed controllable locomotion systems. Applying the specific properties of the epoxy-based SMP, fast switching friction can be achieved by adjusting the topography and stiffness of the microstructures on the surface. In addition, the photothermogenesis effect of Fe3O4 nanoparticles induces changes in the asymmetric topography and stiffness on the SMP surface under the irradiation of near-infrared (NIR) light, thereby inducing a rapid switching of the friction force. Furthermore, a microbot is created to demonstrate remotely controlled locomotion, such as unidirectional and round-trip movements, and braking by switching the friction force under NIR light. These results are promising for the design of new intelligent surfaces and interfaces; additionally, they may facilitate the investigation of biological structures and processes.

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Friction
Pages 1180-1191
Cite this article:
JI Z, QIN S, MA S, et al. Bio-inspired smart surface to achieve controllable locomotion through adjustable anisotropic friction. Friction, 2022, 10(8): 1180-1191. https://doi.org/10.1007/s40544-021-0520-6

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Received: 13 June 2020
Revised: 17 October 2020
Accepted: 15 April 2021
Published: 31 July 2021
© The author(s) 2021.

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