Remote Control over Underwater Dynamic Attachment/Detachment and Locomotion,Advanced Materials

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Remote Control over Underwater Dynamic Attachment/Detachment and Locomotion
Advanced Materials ( IF 27.4 ) Pub Date : 2018-06-19 , DOI: 10.1002/adma.201801595
Yanfei Ma _{1,

2} , Shuanhong Ma ₁ , Yang Wu ₁ , Xiaowei Pei ₁ , Stanislav N. Gorb ₃ , Zuankai Wang ₄ , Weimin Liu _{1,

5} , Feng Zhou _{1,

5}

Affiliation

Despite extensive efforts to mimic the fascinating adhesion capability of geckos, the development of reversible adhesives underwater has long been lagging. The appearance of mussels‐inspired dopamine chemistry has provided the feasibility to fabricate underwater adhesives; however, for such a system, imitating the reversible and fast dynamic attachment/detachment mechanism of gecko feet still remains unsolved. Here, by synthesizing a thermoresponsive copolymer of poly(dopamine methacrylamide‐co‐methoxyethyl‐acrylate‐co‐N‐isopropyl acrylamide) and then decorating it onto mushroom‐shaped poly(dimethylsiloxane) pillar arrays, a novel underwater thermoresponsive gecko‐like adhesive (TRGA) can be fabricated, yielding high adhesion during the attachment state above the lower critical solution temperature (LCST) of the copolymer, yet low adhesion during the detachment state below the LCST of the copolymer. By integrating the Fe₃O₄ nanoparticles into the TRGA, TRGAs responsive to near‐infrared laser radiation can be engineered, which can be successfully used for rapid and reversible remote control over adhesion so as to capture and release heavy objects underwater because of the contrast force change of both the normal adhesion force and the lateral friction force. It is also demonstrated that the material can be assembled on the tracks of an underwater mobile device to realize controllable movement. This opens up the door for developing intelligent underwater gecko‐like locomotion with dynamic attachment/detachment ability.

中文翻译：

水下动态附着/分离和运动的远程控制

尽管人们为模仿壁虎迷人的粘合能力付出了巨大的努力，但水下可逆粘合剂的开发一直滞后。贻贝启发的多巴胺化学剂的出现为制造水下胶粘剂提供了可行性。但是，对于这样的系统，模仿壁虎脚的可逆和快速动态附着/分离机制仍然没有解决。这里，通过合成的聚热响应共聚物（多巴胺methacrylamide-共甲氧基乙基-丙烯酸酯-共- ñ异丙基丙烯酰胺），然后将其装饰到蘑菇形的聚二甲基硅氧烷柱阵列上，可以制造新型的水下热响应壁虎状粘合剂（TRGA），在较低的临界溶液温度（LCST）以上的附着状态下产生高附着力低于共聚物的LCST，在剥离状态下仍具有较低的粘合力。通过整合Fe ₃ O ₄纳米粒子进入TRGA后，可以设计出对近红外激光辐射有响应的TRGA，由于两种正常粘附力的反作用力变化，可以成功地将TRGA成功用于粘附力的快速和可逆远程控制，从而在水下捕获和释放重物。力和侧向摩擦力。还证明了该材料可以被组装在水下移动设备的轨道上以实现可控的运动。这为开发具有动态附着/分离能力的智能水下壁虎式运动打开了大门。

更新日期：2018-06-19

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