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Leaf Vein-Inspired Programmable Superstructure Liquid Metal Photothermal Actuator for Soft Robots
Xiaofei Li1,2, Yiming Du1,2, Xiaoshuan Pan1,3
1Key Lab of Photovoltaic and Energy Conservation Materials, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China.
Advanced Materials (Deerfield Beach, Fla.)
|February 16, 2025
Summary
Researchers developed novel programmable photothermal actuators using laser-etched grooves. These liquid metal (LM) actuators overcome limitations in speed and load capacity, enabling advanced robotics applications.
Area of Science:
- Materials Science
- Robotics
- Nanotechnology
Background:
- Photothermal actuators offer simple structures and precise control but face limitations in response speed, deformation, and load capacity due to thickness constraints.
- Existing designs often struggle to balance high load-carrying capacity with rapid response times, hindering their practical applications.
Purpose of the Study:
- To design and fabricate advanced programmable photothermal actuators that overcome the inherent trade-offs between load-carrying capacity and response speed.
- To enhance the stability and durability of photothermal actuators for demanding applications.
Main Methods:
- Utilized laser etching to create ordered grooves on liquid metal (LM) photothermal actuators, inspired by plant leaf venation.
- Developed a composite material of low-expansion polyimide (PI) and polydimethylsiloxane (PDMS) integrated with liquid metal (LM@PI/PDMS).
- Incorporated LM microspheres to improve actuator stability and longevity.
Main Results:
- Achieved a remarkable load-carrying capacity of 190 times the actuator's weight.
- Demonstrated a high oscillation frequency of 19 Hz and a rapid response speed of 60.96 ± 3.08°/s.
- Exhibited a significant bending angle of 159.05 ± 2.52° and durability exceeding 20,800 cycles.
Conclusions:
- The novel grooved superstructure design effectively resolves the conflict between load-carrying capacity and response speed in photothermal actuators.
- The enhanced actuators exhibit superior performance and stability, paving the way for versatile smart devices and advanced robotics.
- This work presents a new fabrication strategy for programmable photothermal actuators with broad potential in complex environments.
