McGill Engineers Unveil Shapeshifting Materials for Soft Robotics

Researchers at McGill University have developed innovative ultra-thin materials that can be programmed to move and reshape, resembling animated origami. This breakthrough presents new possibilities for the design of soft robots, which could be utilized in medical tools, wearable devices, and responsive packaging, enhancing safety and adaptability in various applications.

The research, led by Hamid Akbarzadeh from the Department of Bioresource Engineering and Marta Cerruti from the Department of Mining and Material Engineering, highlights how simple, paper-like sheets made from folded graphene oxide (GO) can be engineered into tiny devices capable of walking, twisting, and sensing their own movements. The findings are detailed in two significant studies that illustrate the scalability and programmability of these materials, which can be activated by humidity or magnetic fields.

In the words of Cerruti, “Graphene oxide films are highly promising for next-generation soft robots and adaptive actuators, yet their real-world deployment remains limited.” She emphasized that the materials have traditionally been brittle and challenging to manufacture, which restricts their potential for complex or programmable motion.

The team successfully created GO films that are both strong and flexible, making them ideal for soft robotics. These robots must be lightweight and safe for human interaction while retaining the ability to execute intricate movements without the need for heavy motors or rigid components.

The first study showcases an origami-like structure that opens when exposed to humidity and closes again as it dries. This functionality could lead to applications in environments where moisture levels fluctuate, providing a responsive mechanism for various technologies. The second study integrates tiny magnetic particles into similar shapes, allowing for remote control through magnets without requiring batteries or wires.

The researchers discovered that the electric conductivity of the graphene oxide layer changes as the material bends. This feature enables the folded structures to sense their own movements, functioning as both actuators and sensors. According to Akbarzadeh, “These advances enable robust, reconfigurable and multifunctional GO metamaterials capable of complex motion, user-defined shape changes, integrated sensing, and real-time feedback.”

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.

These projects received support from the New Frontiers in Research Fund, the Canada Research Chairs program in Multifunctional Metamaterials, NSERC Discovery Grants, the Canada Foundation for Innovation, and an FRQNT doctoral scholarship.

The new materials developed by the research team at McGill University could represent a significant leap forward in the field of robotics, paving the way for future advancements in technology that require adaptable and responsive components.