Abstract
Inspired by the microstructure of gecko toes, a drivable bionic gecko toe adhesion surface with double-layer structure was designed and fabricated. The driving ability is derived from the volume shrinkage of the dehydrated hydrogel after the driving hydrogel layer is irradiated by near-infrared light (808 nm) (the temperature of the single-layer hydrogel can be increased from 17.9 °C to 107 °C within 30s, and the curling angle can be curled by 0°–180°, similar to the folded state.), and another layer with a microstructure similar to gecko toes can withstand a maximum shear force of 22.4N/cm−2. The different properties of the two layers are combined together to achieve a reversible transition of adhesion/desorption similar to the gecko walking process. The double-layer structure of the drivable bionic gecko toe adhesion surface was structurally optimized to prepare a four-arm gripper that could grasp/release only by unilateral irradiation. This bilayer-structured bionic gecko toe adhesion surface has great design potential, and in the future, it is hoped that it can provide insights into the preparation of large-actuated remote-controlled robots and fast-actuated soft robots.
| Original language | English |
|---|---|
| Article number | 100919 |
| Pages (from-to) | 1-8 |
| Number of pages | 8 |
| Journal | Materials Today Physics |
| Volume | 29 |
| DOIs | |
| Publication status | Published - Dec 2022 |
| MoE publication type | A1 Journal article-refereed |
Funding
The authors (Xiaoxiao Dong, No. 202006440137 ; No. 201908530039 ) would like to acknowledge the support by China Scholarship Council . This work was supported by the National Natural Science Foundation of China (No. 52211530034 , No. 51875577 ), Natural Sciences and Engineering Research Council of Canada ( NSERC ), the Canada Research Chairs Program, the National Natural Science Foundation of China (No. 51575528 ), the Science Foundation of China University of Petroleum -Beijing (No. 2462020XKJS01 ), and the U.S. National Science Foundation (Award No. 2004251 ).
Keywords
- dry adhesives
- Flexible arm gripper
- Gecko
- Gradient
- Hydrogel
- Infrared-responsive
- PDMS
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