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Self-Healing and Shape Memory Effects in Gold Microparticles through the Defects-Mediated Diffusion.

Oleg Kovalenko1, Christian Brandl2, Leonid Klinger1

  • 1Department of Materials Science and Engineering Technion - Israel Institute of Technology 32000 Haifa Israel.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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Summary

Pure gold nanoparticles exhibit self-healing and shape memory effects. Annealing deformed particles restores their original shape through atom diffusion along ledges, a novel mechanism distinct from conventional phase transformations.

Keywords:
atomic force microscopymetal nanoparticlesnanoindentationshape memory effectsurface diffusion

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Metal alloys can exhibit shape memory and self-healing properties after plastic deformation.
  • Conventional mechanisms involve collective, or "military" phase transformations.

Purpose of the Study:

  • To demonstrate a novel self-healing and shape memory effect in pure gold nanoparticles.
  • To investigate the underlying mechanism of shape recovery in these nanoparticles.

Main Methods:

  • Plastic deformation of single crystalline gold nanoparticles using an atomic force microscope tip.
  • Annealing experiments at elevated temperatures.
  • Atomistic molecular dynamic simulations.
  • Development of a semiquantitative healing model.

Main Results:

  • Plastically deformed gold nanoparticles recovered their initial asymmetric polyhedral shape after annealing.
  • Shape recovery occurred even when the final shape was not the global energy minimum.
  • Simulations revealed shape recovery is controlled by self-diffusion of gold atoms along ledge structures formed during indentation.

Conclusions:

  • A new type of self-healing and shape memory effect was demonstrated in pure gold nanoparticles.
  • The mechanism relies on ledge-guided, irreversible diffusion, differing from conventional phase transformations.
  • The developed model accurately predicts the experimental observations of shape recovery.