Self-healing 3D-printed gel has a future in robots and medicine

The 3D-printed hydrogel is a dual polymer that’s capable of bending, twisting or sticking together when treated with certain chemicals. One polymer has covalent bonds, which provide strength and structural integrity. The other polymer has ionic bonds, which allow more dynamic behaviors like bending and self-adhesion. Together, the polymers create a material that is soft, strong and responsive — ideal for creating a soft, robotic grip.

Brown University

Above, the researchers demonstrated the self-adhering behavior on the tail of a 3-D printed hydrogel salamander.

The hydrogel could also be a promising base for microfluidic devices — used for everything from cancer treatments to liquid-based watch tech and detecting explosives. Until now, it’s been hard to pattern hydrogels with the complex channels and chambers needed in microfluidics. But because this new material is 3D-printed, it can be made in stackable LEGO-like blocks, and “complex microfluidic architectures” can be incorporated into each block. These could create a type of modular system in which blocks with different microfluidic channels could be fit together as needed.

The material isn’t quite ready for use. Researchers say they’re still tweaking the polymers to get even more durability and functionality. If they succeed, this could make building soft robotic components and labs-on-a-chip as simple as snapping together LEGO pieces — or at least significantly easier.

Brown University

Above, the self-adhering behavior was used to make hydrogel building blocks that fit together like LEGO blocks.

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