Granular convection is a curious physical phenomenon where agitation causes larger particles to rise to the top of a mixture, regardless of their density. Often called the “Brazil nut effect,” it explains why the largest pieces in a container of mixed snacks invariably surface after a bit of shaking. Researchers at MIT’s Self-Assembly Lab, led by associate professor Skylar Tibbits, are now applying this principle to the standardized, often ill-fitting nature of mass-produced footwear.
For elite athletes, footwear is a bespoke affair, meticulously tailored to foot shapes and specific pressure points. For everyone else, shoes are static products designed for a statistical average. Tibbits and his team are developing midsoles filled with granular materials that reorder themselves during the act of running. As the runner moves, the constant agitation causes the particles within the shoe to shift, effectively evolving a custom support structure that responds to the wearer’s unique gait.
This approach moves away from traditional manufacturing models like 3D printing or molding, which fix a design in place at the factory. Instead, the shoe becomes a dynamic interface that matures through use. By harnessing the inherent behavior of matter, the researchers hope to democratize high-performance personalization, allowing a shoe to "learn" the foot it carries through the simple physics of motion.
With reporting from MIT News.
Source · MIT News
