Void coalescence in core/alloy nanoparticles with stainless interfaces

Wenjie Wu, Mathew M Maye

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

The oxidation properties of nanoparticles with core/alloy microstructure and stainless steel like interfaces is described. In particular, 15-nm Fe/FeCr nanoparticles with a stainless steel like interface are prepared. These particles show a unique morphological transformation that is induced by surface oxidation, oxide passivation, and vacancy coalescence. This Kirkendall diffusion results in a tailorable oxide layer thickness, Fe-core size, as well as void size and symmetry. Much like the interface of bulk stainless steel, the interfacial FeCr oxide passivates oxidation, resulting in self-limited diffusion. Because of this, a highly uniform and stable core-void-shell morphology is observed.

Original languageEnglish (US)
Pages (from-to)271-276
Number of pages6
JournalSmall
Volume10
Issue number2
DOIs
StatePublished - Jan 29 2014

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Keywords

  • core-void-shell
  • core/alloy
  • kirkendall
  • stainless
  • vacancy coalescence

ASJC Scopus subject areas

  • Biomaterials
  • Engineering (miscellaneous)
  • Biotechnology

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