McGill Engineers Develop Shapeshifting Materials for Soft Robotics

Researchers at McGill University have unveiled groundbreaking ultra-thin materials that can be programmed to move, fold, and reshape themselves, akin to animated origami. This innovation paves the way for the next generation of soft robots, which could enhance medical tools that navigate the body gently, wearable devices that adapt on the skin, and smart packaging that responds to environmental changes.

The research is spearheaded by Hamid Akbarzadeh from the Department of Bioresource Engineering and Marta Cerruti from the Department of Mining and Material Engineering. They demonstrated that simple, paper-like sheets made from folded graphene oxide (GO) can be transformed into tiny devices capable of walking, twisting, flipping, and sensing their own movements. Two complementary studies highlight the scalability of these materials, showcasing how they can be programmed to change shape in response to humidity or magnetic fields.

“Graphene oxide films are highly promising for next-generation soft robots and adaptive actuators,” said Cerruti. “Yet their real-world deployment remains limited because they are brittle, challenging to manufacture at scale, and unable to generate complex or programmable motion.” An actuator is a component that converts energy into motion, enabling controlled movement.

The research team has successfully created GO films that exhibit both strength and flexibility, making them ideal for soft robots that require lightweight and safe movement around humans. The innovative materials allow for complex motion without the need for heavy motors or rigid components.

In their first study, the team developed an origami-like structure that opens in response to humidity and closes as it dries. This feature could be invaluable in medical applications where gentle movements are crucial. The second study combined similar shapes with tiny magnetic particles, allowing for remote steering using magnets, eliminating the need for wires or batteries.

The unique characteristic of the graphene oxide layer to conduct electricity changes as the material bends enables these folded structures to sense their own motion. This dual capability allows the structures to function as both actuators that facilitate movement and sensors that monitor that movement.

“These advances enable robust, reconfigurable, and multifunctional GO metamaterials capable of complex motion, user-defined shape changes, integrated sensing, and real-time feedback,” stated Akbarzadeh. “This marks the emergence of the first reconfigurable sensoriactuator metamaterials.”

The studies, titled “Strong and flexible graphene oxide paper for humidity responsive origami metamaterials” and “Multifunctional and Reprogrammable Magnetoactive Graphene Oxide Origami,” were published in the journals Materials Horizons and Advanced Science, respectively. They were co-authored by researchers including Yiwen Chen and Jun Cai, and are part of a wider research effort supported by the New Frontiers in Research Fund, the Canada Research Chairs program in Multifunctional Metamaterials, and various other grants.

This innovative work not only illustrates the potential for advanced materials in robotics but also signifies a significant step toward creating adaptable technologies that can interact intelligently with their surroundings. The implications of this research could extend across various industries, transforming how we think about robotics and material science.