Photo credit: Carolina Garcia Tavizon/Unsplash.com

Date: 30 July 2020

Institution: University of Michigan

Study published in: Advanced Functional Materials

Digest: Researchers have demonstrated that behavioral rules underpinning the Japanese art of folding can expand the capabilities of these machines, creating potential for greater use in fields as diverse as medical equipment and infrastructure sensing.


Origami principles can unlock the potential of the smallest robots, enhancing speed, agility and control in machines no more than a centimeter in size.

“We’ve come up with a new way to design, fabricate and actuate microbots,” said Evgueni Filipov, U-M assistant professor of civil and environmental engineering. “We’ve been the first to bring advanced origami folding capabilities into one integrated microbot system.”

Their bots can form one shape, complete a task, then reconfigure into a second shape for an additional task, and so on.

The research team includes Kenn Oldham, a U-M professor of mechanical engineering, Ph.D. student Yi Zhu and graduate research assistant Mayur Birla.

To date, most microbots have limited movements, which hampers their ability to perform useful tasks. To increase their range of motion, they need to be able to fold at large angles. U-M’s team has created microbots that can fold as far as 90 degrees and more. Larger folds allow microbots to form more complex shapes.

U-M’s unique approach enables its microbots to complete their range of motion up to 80 times per second, a faster pace than most can operate.

Microbots using origami principles often require an outside stimulus to activate, such as heat inside a body or a magnetic field applied to the microbot. U-M’s utilize a layer of gold and a layer of polymer that act as an onboard actuator—meaning no outside stimulus is needed.

Yi Zhu, Graduate Student Research Assistant for Civil and Environmental Engineering, tests a new generation of micro-robotics inside Evgueni Filipov’s lab at the G.G. Brown Building on North Campus, Ann Arbor Mi. on June 17, 2020. Image credit: Robert Coelius/University of Michigan

While the microbots are currently controlled by a tether, eventually, an onboard battery and a microcontroller will apply an electric current in the systems.

“When current passes through the gold layer, it creates heat, and we use heat to control the motions of the microbot,” Filipov said. “We drive the initial fold by heating the system, then we unfold by letting it cool down.

A new generation of micro-robotics inside Evgueni Filipov’s lab at the G.G. Brown Building on North Campus, Ann Arbor Mi. on June 17, 2020. Image credit: Robert Coelius/University of Michigan

“To get something to fold and stay folded, we overheat the system. When we overheat, we can program the fold—change where it comes to rest.”

These capabilities allow microbots to function elastically and plastically—giving them the ability to recover their original shape.


The research was supported by the Defense Advanced Research Projects Agency and the U-M College of Engineering Dean’s Fellowship.

Original written by: Jim Lynch

Source: University of Michigan

Interested in original study: read here