A soft robot swims like a nematode under a magnetic field

What is it about?

This study presents a tiny soft robot that swims underwater by mimicking the undulating movement of nematodes, such as C. elegans. The robot is made of a magnetic soft filament attached to a rigid frame. When exposed to a rotating magnetic field, it bends rhythmically to propel itself forward—similar to how nematodes move through fluids. Using advanced simulations, the authors study how the robot's magnetic properties, stiffness, surrounding fluid type, and nearby surfaces affect its swimming efficiency. The research offers insight into designing small, flexible robots for use in confined environments like inside the human body.

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Photo by Jonathan Borba on Unsplash

Photo by Jonathan Borba on Unsplash

Why is it important?

Soft microrobots are promising tools for biomedical applications because they can move gently and safely through delicate environments, such as human tissues or blood vessels. However, it's challenging to design them for stable and efficient swimming in real-world fluid conditions. This study sheds light on how to fine-tune a soft robot’s design—especially its shape and magnetic response—to improve performance even in complex fluids or near boundaries. These findings may lead to new robotic systems for minimally invasive medical tasks or targeted drug delivery.