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A natural impact-resistant bicontinuous composite nanoparticle coating.

Wei Huang1,2, Mehdi Shishehbor3, Nicolás Guarín-Zapata3

  • 1Department of Chemical and Environmental Engineering, University of California, Riverside, CA, USA.

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|August 19, 2020
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Summary

Mantis shrimp dactyl clubs possess a unique impact-resistant coating made of hydroxyapatite nanoparticles. This structure enables damage localization and prevents failure during high-speed strikes, outperforming engineered materials.

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Area of Science:

  • Biomaterials science
  • Mechanics of materials
  • Structural biology

Background:

  • Nature creates advanced materials under environmental constraints.
  • The mantis shrimp's dactyl club is a strong, tough composite material.
  • This structure withstands high-speed impacts during feeding.

Purpose of the Study:

  • To investigate the impact-resistant coating of the mantis shrimp's dactyl club.
  • To understand the structural mechanisms behind its damage tolerance.
  • To compare its properties with engineered materials.

Main Methods:

  • Analysis of the dactyl club's impact surface composition.
  • Microstructural characterization of hydroxyapatite nanoparticles and organic matrix.
  • High strain rate impact testing to observe material behavior.

Main Results:

  • The coating consists of ~65-nm bicontinuous hydroxyapatite nanoparticles (~88% by volume) in an organic matrix.
  • Nanoparticles are mesocrystalline, assembled from aligned nanocrystals.
  • Under high strain rates, particles move, nanocrystalline networks fracture and amorphize.
  • The organic network provides toughening and damping (loss coefficient ~0.02).

Conclusions:

  • The mantis shrimp dactyl club achieves high stiffness and damping.
  • This unique combination allows for damage localization and prevents catastrophic failure.
  • The biomaterial design surpasses many engineered impact-resistant materials.