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Locally controllable magnetic soft actuators with reprogrammable contraction-derived motions
Yahe Wu1, Shuai Zhang1, Yang Yang2
1The Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China.
Science Advances
|June 24, 2022
Summary
Researchers developed reprogrammable soft actuators using liquid crystalline elastomers (LCEs) and magnetic fields. These actuators offer versatile morphing, local control, and self-healing for advanced smart devices.
Area of Science:
- Materials Science
- Robotics
- Polymer Chemistry
Background:
- Soft actuators are crucial for smart devices, especially in confined spaces.
- Achieving versatile morphing and precise local magnetic control in soft actuators remains a challenge.
Purpose of the Study:
- To develop reprogrammable magneto-responsive soft actuators with enhanced functionality.
- To explore versatile morphing modes beyond simple bending and enable local magnetic control.
Main Methods:
- Utilizing magnetothermal responsiveness and covalent adaptable networks (CANs) within liquid crystalline elastomers (LCEs).
- Integrating LCEs with varying magneto-responsive thresholds for differentiated control.
- Implementing "logic switch" sequences for complex actuation patterns.
Main Results:
- Demonstrated novel magneto-actuated contraction-derived motions, including bidirectional shrinkage and dynamic 3D patterns.
- Achieved reprogrammable functions and seamless assembly for functional diversity.
- Realized local and sequential magnetic control through integrated LCEs with distinct thresholds.
Conclusions:
- The developed LCE-based soft actuators offer unprecedented control and versatility for smart devices.
- The system exhibits stepwise magnetic controllability, multi-responsiveness, self-healing, and remolding abilities.
- This work paves the way for advanced on-demand applications in confined environments.
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