Tiny structures consisting of mushroom-shaped micropillars topped with nanopores allow a lizard to quickly detach its tail when needed, research shows in Science. The findings provide insights to inform applications like quick-release mechanisms.
When under attack, lizards will shed their tails as a way of escaping the predator while leaving behind a wiggling decoy to distract the enemy. The tail needs to be firmly attached most of the time, but it must also have a quick-release mechanism that won’t engage during normal activities. Baban. devised a multiscale hierarchical model for the tail attachment .
We propose a biomimetic fracture model of lizard tail autotomy using multiscale hierarchical structures. The structures consist of uniformly distributed micropillars with nanoporous tops, which recapitulate the high-density mushroom-shaped microstructures found on the lizard tail’s muscle fracture plane. The biomimetic experiments showed adhesion enhancement when combining nanoporous interfacial surfaces with flexible micropillars in tensile and peel modes.
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