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MIT Engineers Print Synthetic ‘Metamaterials’ That Are Strong, Stretchy

New method could use ceramics, glass, and metals for tear-proof textiles or stretchy semiconductors

 Courtesy of the researchers

Metamaterials are synthetic materials with microscopic structures that give the overall material exceptional properties.

Jennifer Chu
Tue, 06/03/2025 - 12:02
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In metamaterials design, the name of the game has long been “stronger is better.”

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Metamaterials are synthetic materials with microscopic structures that give the overall material exceptional properties. A huge focus has been in designing metamaterials that are stronger and stiffer than their conventional counterparts. But there’s a trade-off: The stiffer a material, the less flexible it is.

MIT engineers have now found a way to fabricate a metamaterial that is both strong and stretchy. The base material is typically highly rigid and brittle, but it is printed in precise, intricate patterns that form a structure both strong and flexible.

The key to the new material’s dual properties is a combination of stiff microscopic struts and a softer woven architecture. This microscopic “double network,” which is printed using a Plexiglas-like polymer, produced a material that could stretch more than four times its size without fully breaking. In comparison, the polymer in other forms has little to no stretch and shatters easily once cracked.

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