Electrically programmable adhesive hydrogels for climbing robots

自愈水凝胶 胶粘剂 粘附 机器人 攀登 材料科学 计算机科学 纳米技术 工程类 复合材料 高分子化学 人工智能 结构工程 图层(电子)
作者
Junwen Huang,Yu Liu,Yuxin Yang,Zhijun Zhou,Jie Mao,Tong Wu,Jun Liu,Qipeng Cai,Chaohua Peng,Yiting Xu,Birong Zeng,Weiang Luo,Guorong Chen,Conghui Yuan,Lizong Dai
出处
期刊:Science robotics [American Association for the Advancement of Science]
卷期号:6 (53) 被引量:166
标识
DOI:10.1126/scirobotics.abe1858
摘要

Although there have been notable advances in adhesive materials, the ability to program attaching and detaching behavior in these materials remains a challenge. Here, we report a borate ester polymer hydrogel that can rapidly switch between adhesive and nonadhesive states in response to a mild electrical stimulus (voltages between 3.0 and 4.5 V). This behavior is achieved by controlling the exposure and shielding of the catechol group through water electrolysis-induced reversible cleavage and reformation of the borate ester moiety. By switching the electric field direction, the hydrogel can repeatedly attach to and detach from various surfaces with a response time as low as 1 s. This programmable attaching/detaching strategy provides an alternative approach for robot climbing. The hydrogel is simply pasted onto the moving parts of climbing robots without complicated engineering and morphological designs. Using our hydrogel as feet and wheels, the tethered walking robots and wheeled robots can climb on both vertical and inverted conductive substrates (i.e., moving upside down) such as stainless steel and copper. Our study establishes an effective route for the design of smart polymer adhesives that are applicable in intelligent devices and an electrochemical strategy to regulate the adhesion.
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