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From Sea Cucumbers to Soft Robots: A Photothermal-Responsive Hydrogel Actuator with Shape Memory
Jinxue Zhao1,2,3, Xuejing Zhai2,4, Peiyi Li1,2,3
1College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China.
ACS Applied Materials & Interfaces
|January 20, 2025
Summary
Researchers developed a novel photothermal-responsive hydrogel actuator inspired by sea cucumbers. This smart material exhibits shape memory and controlled actuation using near-infrared light, advancing soft robotics and biomedical applications.
Area of Science:
- Materials Science
- Robotics
- Biomedical Engineering
Background:
- Soft robotics relies on materials that convert stimuli into mechanical action.
- Existing hydrogels have limitations in responsiveness and shape control.
Purpose of the Study:
- To develop a photothermal-responsive hydrogel actuator with shape memory capabilities.
- To mimic sea cucumber locomotion for adaptive soft robotic applications.
Main Methods:
- Fabrication of a hydrogel using sea cucumber peptides (SCP) and liquid metal (LM).
- Integration of a shape memory polymer (SMP) for shape retention.
- Utilizing near-infrared (NIR) light for photothermal actuation.
Main Results:
- The SCP/LM hydrogel demonstrated controlled volumetric and shape changes upon NIR irradiation.
- The actuator exhibited excellent stretchability (3,000%) and adhesion (21 kPa) with no observed toxicity.
- Rapid and complex shape deformations (bending) were achieved within 100 seconds of NIR exposure.
Conclusions:
- The developed hydrogel actuator overcomes limitations of traditional hydrogels.
- It offers significant potential for advanced soft robotics and biomedical devices.
- This work presents a new pathway for smart soft materials with integrated shape memory and photothermal responsiveness.
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