Mantis Shrimp: Researchers from the US and France found that the mantis shrimp uses a unique microstructure in its dactyl club to protect itself from recoil during high-speed strikes.
o Dactyl club strikes prey at 23 m/s, 50-times faster than a blink. Strike generates shockwaves, but the shrimp remains unharmed.
o Microstructure in the club enables phononic shielding, blunting acoustic waves.
o Lasers revealed the club's response at billionth-of-a-second intervals.
o Club stores energy in spring-like structures and releases it via latch-like tendons.
o Punch forms low-pressure zones, creating vapour bubbles.
o Bubbles collapse to release heat and high-frequency shockwaves.
o Layers Comprises: Outer layer is hard hydroxyapatite, distributing recoil & Inner layers have biopolymer fibres for impact resistance.
o Applications: Include protective gear, earmuffs, and injury prevention.
o Researchers are exploring biomimetic structures for wave trapping and energy conversion.
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