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Researchers at Kyushu University in Japan have advanced wearable technology. The team designed a thin-film electronics that can automatically connect, disconnect, and reorganize itself.
The study introduces a new class of “kinetic electronics” that move away from the rigid, one-piece designs dominating the market today.
“Today, most of these devices are made as fixed, one-piece systems. For some time now, our group has been developing kinetic electronics, thin-film devices with actuators and circuits so they can move, attach and function together,” explained Fumihiro Sassa, Associate Professor at Kyushu University’s Faculty of Information Science and Electrical Engineering.
“In this study, we worked to develop an electromechanical docking mechanism between these thin-film modules that can connect and disconnect with one another when needed,” Sassa added.
Dock with each other
Flexible electronics involves building circuits on pliable materials for devices to bend and stretch without breaking. This adaptability makes it ideal for skin-like wearable health sensors, flexible medical implants, and soft robots that can safely interact with humans and tight spaces.
The new innovation lies in a smart material cocktail. The team fused the device’s electrical circuits with a specialized actuator layer made of two plastics: polypropylene and polyimide.
When a built-in gold microheater warms the film, the two plastics expand at different rates, causing the entire module to bend on command.
Using this bending motion, the researchers designed various mechanical docking systems. One version uses a looping mechanism to connect modules. Another features a claw-like attachment that stays locked in place even after the power is turned off.
“We developed a few different variations of docking methods with the device. For example, one can loop and hook onto another. Another has a clawlike attachment that can lock onto another device and stay locked even when the power is turned off,” Sassa said.
Morphing gadgets
According to the study, two distinct configurations based on kinetic electronics were developed: a single-plane probe assembly mechanism and a separation module assembly mechanism.
Interestingly, the system successfully establishes simultaneous mechanical coupling and electrical continuity between independent modules.
Operating at a low voltage of 5 to 12 V, the system utilizes a probe mechanism capable of a 10 mm deformation at 1.1 W during docking. Complementing this, the highly efficient separation module draws a mean operating power of only 0.43 W while sustaining a mean maximum holding force of 618 mgf (6.1 mN).
Further, this connection remains locked and continuous even when the power is completely turned off (unpowered state). It showcased the viability of reconfigurable, self-assembling thin-film systems.
There are several applications of this technology.
In the future, medical sensors could morph to track different vital signs. Soft robots could change shape to squeeze through tight spaces. Shattered circuits could potentially stitch themselves back together.
While the technology is still in its infancy, the ultimate goal is to bridge the gap between machinery and biology. Sassa hopes the project will eventually yield advanced devices that can — much like living organisms — self-assemble, adapt to their surroundings, and autonomously repair themselves.
The findings were published in the journal npj Flexible Electronics.
