Wu Yahe, Zhang Shuai, Yang Yang, Li Zhen, Wei Yen, Ji Yan
The Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China.
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China.
Sci Adv. 2022 Jun 24;8(25):eabo6021. doi: 10.1126/sciadv.abo6021.
Reprogrammable magneto-responsive soft actuators capable of working in enclosed and confined spaces and adapting functions under changing situations are highly demanded for new-generation smart devices. Despite the promising prospect, the realization of versatile morphing modes (more than bending) and local magnetic control remains challenging but is crucial for further on-demand applications. Here, we address the challenges by maximizing the unexplored potential of magnetothermal responsiveness and covalent adaptable networks (CANs) in liquid crystalline elastomers (LCEs). Various magneto-actuated contraction-derived motions that were hard to achieve previously (e.g., bidirectional shrinkage and dynamic 3D patterns) can be attained, reprogrammed, and assembled seamlessly to endow functional diversity and complexity. By integration of LCEs with different magneto-responsive threshold values, local and sequential magnetic control is readily realized. Many magnetic actuation portfolios are performed by rationally imputing "logic switch" sequences. Meanwhile, our systems exhibit additional favorable performances including stepwise magnetic controllability, multiresponsiveness, self-healing, and remolding ability.
新一代智能设备对可重新编程的磁响应软致动器有很高的需求，这种致动器能够在封闭和受限空间中工作，并在不断变化的情况下适应功能。尽管前景广阔，但实现多种变形模式（不仅仅是弯曲）和局部磁控制仍然具有挑战性，但对于进一步的按需应用至关重要。在这里，我们通过最大限度地挖掘磁热响应性和共价自适应网络（CANs）在液晶弹性体（LCEs）中的未开发潜力来应对这些挑战。以前难以实现的各种磁驱动收缩衍生运动（例如双向收缩和动态3D图案）可以实现、重新编程并无缝组装，以赋予功能多样性和复杂性。通过集成具有不同磁响应阈值的LCEs，可以轻松实现局部和顺序磁控制。许多磁驱动组合是通过合理输入“逻辑开关”序列来执行的。同时，我们的系统还表现出其他有利性能，包括逐步磁可控性、多响应性、自修复和重塑能力。
