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When you pull something—like a rubber band—you expect it to get longer. But what if it did the opposite? What if it suddenly shrank instead? In a study published on April 14 in Proceedings of the National Academy of Sciences (PNAS), researchers from AMOLF(@AMOLF-Official) & ARCNL (@ARCNL-NL) have made this possible. They created structures that snap inward when pulled outward. This surprising behavior defies conventional understanding of materials and opens up exciting applications in soft robotics, smart devices, and vibration control systems. Combining building blocks To make this counterintuitive behavior happen, the team developed a clever design strategy: instead of trying to build the complex behavior all at once, they started with small, more simple parts and combined them in a specific way. The result? Structures that suddenly contract when pulled - something previously thought to be nearly impossible to achieve in practice. According to first author Paul Ducarme: “It’s like discovering a new building block for mechanical systems. It behaves in a completely unexpected way—but once you understand it, you can use it to do amazing things.” Applications The researchers demonstrated that these countersnapping structures can lead to exotic properties that could potentially be useful in a range of applications. Examples include: - One-way sliding motion without motors or electronics — potentially useful in soft robots that need to move forward without slipping backward, such as medical robots navigating through the body. - Materials that switch stiffness on demand — ideal for wearable exosuits or prosthetics that need to be flexible during movement but stiffen instantly for support or safety. - Structures that dampen excessive vibration all by themselves — potentially lifesaving in systems like airplanes, wind turbines, or even buildings in earthquake-prone areas. Just the beginning The researchers believe this is just the beginning. Much like traditional snapping is used in things like pop-up tents, snapping toys, and deployable space structures, countersnapping could find its way into a new generation of technologies that are smarter, faster, and more adaptive. Reference Paul Ducarme, Bart Weber, Martin van Hecke and Johannes T.B. Overvelde, “Exotic mechanical properties enabled by countersnapping instabilities,” Proceedings of the National Academy of Sciences (PNAS), April 14 (2025). Downloads ⬇️ Download the design files + tutorial – https://paulducarme.com/projects.html Websites 🔬 AMOLF Website – https://amolf.nl/ 💼 AMOLF LinkedIn – https://www.linkedin.com/company/amolf 🔬 ARCNL Website – https://arcnl.nl/ 💼 ARCNL LinkedIn – https://www.linkedin.com/company/arcnl Relevant research groups: Mechanical Metamaterials - https://amolf.nl/research-groups/mechanical-metamaterials Soft Robotic Matter - https://amolf.nl/research-groups/soft-robotic-matter #AMOLF #ARCNL #science #PNAS

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