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PNAS Study Finds Soft Coral Uses Natural Jamming to Switch From Flexible to Rigid

Penn Engineers report the first instance of hard‑particle granular jamming in a living organism.

Overview

  • The team showed that Leptogorgia chilensis expels water from a gel-like matrix, packing mineral sclerites until they interlock and the branch stiffens.
  • Sclerites are calcium carbonate elements about a tenth of a millimeter long with branched, rod-like geometry that promotes friction and interlocking.
  • Researchers combined multiscale imaging, parametric modeling, 3D printing, mechanical tests, and discrete element simulations to validate the mechanism.
  • The findings suggest design blueprints for tunable materials in areas such as soft robotics, surgical tools, dampers, and manufacturing, though applications remain prospective.
  • The peer-reviewed work focuses on a single species and includes tests on preserved samples, and the authors call for studies across other soft corals to assess broader relevance.