Self-Healing of Nanoporous Gold Under Ambient Conditions
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- Self-Healing of Nanoporous Gold Under Ambient Conditions
- Gwak, Eun-Ji; Jeon, Hansol; Song, Eunji; Kim, Ju-Young
- Issue Date
- AMER CHEMICAL SOC
- NANO LETTERS, v.20, no.9, pp.6706 - 6711
- Failure of a material is an irreversible process since the material loses its original characteristics and properties. The catastrophic brittle failure under tensile stress of nanoporous gold (np-Au) with a bicontinuous open-cell structure makes impossible otherwise attractive applications. Here, we first demonstrate a self-healing process in tensile-fractured np-Au to overcome the limit of fragility via mechanically assisted cold-welding under ambient conditions. The self-healing ability of np-Au in terms of mechanical properties shows strength recovery up to 64.4% and fully recovered elastic modulus compared with initial tensile properties. Topological parameters obtained by three-dimensional reconstruction of self-healed np-Au clarify the strength, elastic modulus, and strain distribution. The self-healing process in np-Au is attributed to surface diffusion expedited by local compressive stress in the ultrasmall dimension of ligaments formed by ductile failures of individual ligaments.
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