Edible aquatic robots with Marangoni propulsion

Area of Science:

• Robotics
• Environmental Science
• Materials Science

Background:

• Existing aquatic robots utilize artificial polymers and electronics, posing risks of pollution and ecological disruption if not retrieved.
• The need for sustainable and non-disruptive aquatic monitoring and intervention technologies is critical for sensitive ecosystems.

Purpose of the Study:

• To design and demonstrate a fully biodegradable and edible self-propelled aquatic device.
• To address the environmental challenges posed by conventional aquatic robots through a sustainable alternative.

Main Methods:

• Leveraged the Marangoni effect for autonomous propulsion of the aquatic robot.
• Constructed the robot's body from freeze-dried fish food, ensuring biodegradability and edibility.
• Utilized a water-triggered pneumatic reaction for sustained surfactant release, powering the device's motion.

Main Results:

• Successfully created a self-propelled, centimeter-scale aquatic robot with a biodegradable and edible composition.
• Demonstrated autonomous propulsion driven by the Marangoni effect and a safe, water-triggered surfactant release mechanism.
• The device's non-toxic nature allows for safe deployment in aquatic environments for various applications.

Conclusions:

• The developed edible aquatic robot offers a novel, environmentally benign solution for aquatic monitoring, exploration, and intervention.
• This technology eliminates the need for retrieval, reducing ecological impact and enabling large-scale deployment.
• The robot's composition provides potential for dual use, offering nutrition to aquatic wildlife post-deployment.