Rewritable wavelength-selective hydrogel actuators grafted with fluorophores
Hye Been Koo1, Haemin Yeon1, Young Bin Yoon1
1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea. jbchang03@kaist.ac.kr.
Materials Horizons
|January 3, 2025
Summary
Researchers developed new light-controlled soft actuators. These hydrogel actuators offer wavelength-selective and rewritable shape changes, advancing soft robotics.
Area of Science:
- Materials Science
- Robotics
- Polymer Chemistry
Background:
- Stimuli-responsive soft actuators mimic natural movements.
- Existing hydrogel actuators lack wavelength-selectivity and reprogrammability.
- Limited degrees of freedom hinder complex motion in current soft actuators.
Purpose of the Study:
- To develop hydrogel actuators with wavelength-selective and rewritable shape-changing capabilities.
- To integrate fluorophores with temperature-responsive hydrogels for light-driven actuation.
- To overcome limitations in motion control for soft robotic applications.
Main Methods:
- Grafting fluorophores onto temperature-responsive hydrogels.
- Utilizing photothermal effects of fluorophores for light-induced shape morphing.
- Employing iterative chemical bleaching for rewritable shape configurations.
Main Results:
- Achieved wavelength-selective shape morphing at 405, 520, and 638 nm.
- Demonstrated multiple, rewritable shape configurations from a single hydrogel actuator.
- Enabled precise control over actuator shape using light wavelength and bleaching.
Conclusions:
- The novel strategy integrates wavelength-selectivity and rewritability in soft actuators.
- This advancement enables adaptive, reprogrammable actuators for intelligent soft robots.
- The approach opens new possibilities for light-driven soft robotic systems.
