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Soft phototactic swimmer based on self-sustained hydrogel oscillator.
Yusen Zhao1, Chen Xuan2, Xiaoshi Qian1
1Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA.
Science Robotics
|November 2, 2020
Summary
Researchers developed a self-sustained soft oscillator robot, OsciBot, that uses visible light for perpetual, untethered locomotion. This battery-free, phototactic robot offers a new principle for autonomous movement in aquatic environments.
Area of Science:
- Robotics
- Materials Science
- Soft Matter Physics
Background:
- Living organisms utilize oscillations for propulsion, often driven by environmental cues like light.
- Existing artificial oscillators typically require continuous energy input and lack environment-directed movement.
Purpose of the Study:
- To report a self-sustained soft oscillator capable of perpetual, untethered locomotion powered and steered by constant visible light.
- To establish a principle for converting continuous energy input into discontinuous output for autonomous systems.
Main Methods:
- Development of a photoresponsive hydrogel soft oscillator with a self-shadowing negative feedback loop.
- Utilizing dynamic light-material interactions and rapid volume changes for actuation.
- Analytical modeling to understand oscillation mechanisms and identify key design parameters.
Main Results:
- Demonstrated a phototactic soft swimming robot (OsciBot) exhibiting controllable, high-speed locomotion.
- Achieved perpetual, untethered, and omnidirectional movement in 3D space, overcoming water damping.
- Showcased a modular design adaptable to various energy inputs and oscillatory behaviors.
Conclusions:
- The OsciBot represents a battery-free, deployable, and scalable autonomous robot.
- This work establishes a broadly applicable principle for light-driven, self-sustained oscillations.
- Artificial phototaxis in soft robots opens opportunities for marine automation, miniaturized transport, and solar sails.
