A multifunctional origami structure built using the new liquid-metal-treated paper. Image: Cell Reports Physical Science/Yuan et al.
A multifunctional origami structure built using the new liquid-metal-treated paper. Image: Cell Reports Physical Science/Yuan et al.

Everyday materials such as paper and plastic could be transformed into electronic ‘smart devices’ by using a simple new method for applying liquid metal to surfaces. As reported in a paper in Cell Reports Physical Science, the method can be used to apply a liquid metal coating to surfaces that do not easily bond with liquid metal. The approach is designed to work at a large scale and may have applications in wearable testing platforms, flexible devices and soft robotics.

“Before, we thought that it was impossible for liquid metal to adhere to non-wetting surfaces so easily, but here it can adhere to various surfaces only by adjusting the pressure, which is very interesting,” said Bo Yuan, a scientist at Tsinghua University in China and first author of the paper.

Scientists seeking to combine liquid metal with traditional materials have been impeded by liquid metal’s extremely high surface tension, which prevents it from binding with most materials, including paper. To overcome this issue, previous research has mainly focused on a technique called ‘transfer printing’, which involves using a third material to bind the liquid metal to the surface. But this strategy comes with drawbacks – adding more materials can complicate the process and may weaken the end product’s electrical, thermal or mechanical properties.

To explore an alternative approach that would allow them to directly print liquid metal on substrates without sacrificing the metal’s properties, Yuan and his colleagues deposited two different liquid metals (eGaln and BilnSn) on various silicone and silicone polymer stamps. They then applied different forces as they rubbed these stamps onto paper surfaces.

“At first, it was hard to realize stable adhesion of the liquid metal coating on the substrate,” said Yuan. “However, after a lot of trial and error, we finally had the right parameters to achieve stable, repeatable adhesion.”

The researchers found that rubbing the liquid-metal-covered stamp against the paper with a small amount of force allowed the metal droplets to bind effectively to the surface, while applying larger amounts of force prevented the droplets from staying in place.

Next, the team folded the metal-coated paper into a paper crane, demonstrating that the surface can still be folded as usual after the process is completed. And after doing so, the modified paper still maintains its usual properties.

While the technique appears promising, Yuan noted that the researchers are still figuring out how to guarantee that the liquid-metal coating stays in place after it has been applied. For now, a packaging material can be added to the paper’s surface, but the team hopes to figure out a solution that won’t require it.

“Just like wet ink on paper can be wiped off by hand, the liquid metal coating without packaging here also can be wiped off by the object it touches as it is applied,” Yuan explained. “The properties of the coating itself will not be greatly affected, but objects in contact may be soiled.”

In the future, the team plans to build on this method so that it can be used to apply liquid metal to a greater variety of surfaces, including metal and ceramic. “We also plan to construct smart devices using materials treated by this method,” said Yuan.

This story is adapted from material from Cell Press, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier. Link to original source.