Self-healing material a breakthrough for bio-inspired robotics

May 21, 2018, Carnegie Mellon University Mechanical Engineering
A digital clock continues to keep time as damaged circuits instantaneously heal themselves, rerouting electrical signals without interruption. Credit: Nature Materials

Many natural organisms have the ability to repair themselves. Now, manufactured machines will be able to mimic this property. In findings published this week in Nature Materials, researchers at Carnegie Mellon University have created a self-healing material that spontaneously repairs itself under extreme mechanical damage.

This soft-matter composite material is composed of liquid metal droplets suspended in a soft elastomer. When damaged, the droplets rupture to form new connections with neighboring droplets and reroute electrical signals without interruption. Circuits produced with conductive traces of this material remain fully and continuously operational when severed, punctured, or had material removed.

Applications for its use include bio-inspired robotics, human-machine interaction, and wearable computing. Because the material also exhibits that does not change when stretched, it is ideal for use in power and data transmission.

"Other research in soft electronics has resulted in that are elastic and deformable, but still vulnerable to the mechanical damage that causes electrical failure," said Carmel Majidi, an associate professor of mechanical engineering. "The unprecedented level of functionality of our can enable soft-matter electronics and machines to exhibit the extraordinary resilience of soft biological tissue and organisms."

A robotic quadruped functions despite damage, demonstrating the spontaneous, self-healing property of a new material developed at Carnegie Mellon University’s Integrated Soft Materials Laboratory. Credit: Nature Materials

Majidi, who directs the Integrated Soft Materials Laboratory, is a pioneer in developing new classes of materials in the field of soft matter engineering.

"If we want to build machines that are more compatible with the human body and the natural environment, we have to start with new types of materials," he said.

Majidi holds a courtesy appointment in the Robotics Institute. Other authors include Eric Markvicka and Xiaonan Huang of Carnegie Mellon University, and Michael D. Bartlett of Iowa State University.

Explore further: Invisible, stretchable circuits to shape next-gen tech

More information: "An autonomously electrically self-healing liquid metal–elastomer composite for robust soft-matter robotics and electronics" Nature Materials, DOI: 10.1038/s41563-018-0084-7

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