Researchers at the University of Colorado Boulder are developing a new class of materials inspired by a familiar object: the office staple. Their work shows how interlocking particles can create strong yet reversible systems. This approach could support circular design, adaptive architecture and innovative product development.

Designing Strength Through Entanglement

The study, published in the Journal of Applied Physics, focuses on “entanglement”. This occurs when particles interlock and form stable structures. Nature already uses this principle. Bird nests and bone structures rely on similar interwoven systems.

The key innovation lies in particle shape. Smooth materials like sand cannot interlock because of their rounded form. By contrast, specially designed particles can hook into each other. The researchers used computational simulations to test different geometries. They found that a two-legged shape, similar to a staple, delivers the strongest entanglement. These particles form dense structures that behave like solid materials under stress. At the same time, they can be taken apart when needed.

A Rare Combination of Properties

The material combines strength and toughness, which rarely occur together. The interlocking particles resist pulling forces while remaining resilient. The system also responds to vibration. Light vibrations increase interlocking and strengthen the structure. Stronger vibrations loosen the connections and cause the material to fall apart. This behaviour allows designers to control the material state in real time. As a result, the material sits between a solid and a granular system. This hybrid behaviour opens up new design possibilities.

Implications for Circular and Adaptive Design

This research offers clear opportunities for architecture and design. Designers could create structures without adhesives or permanent connections. Therefore, components could be easily disassembled and reused. Such systems align with circular construction principles. Materials can return into use without losing value. Potential applications include temporary buildings, modular interiors and reconfigurable installations.

In product design, these materials could support repairable or adjustable components. Designers could rethink how products are assembled and maintained over time.

Next Steps in Material Development

The research team is now testing new particle shapes. Some designs take inspiration from plant burrs, with additional protrusions to increase interlocking strength. Scaling up production remains a challenge, but the concept is promising.

This research introduces a new way of designing materials. Instead of fixed connections, it focuses on reversible systems. As sustainability becomes more urgent, such materials could play an important role in future design strategies.

Source & photo: University of Colorado Boulder