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Enhanced oxidation of nanoparticles through strain-mediated ionic transport
Andrew Pratt1, Leonardo Lari2, Ondrej Hovorka3
11] Department of Physics, University of York, York YO10 5DD, UK [2] International Center for Young Scientists, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
Nature Materials
|November 5, 2013
Summary
Nanoparticle geometry drives oxidation. Strain gradients in the oxide shell enhance diffusion, leading to oxide domains and shape changes in iron nanoparticles. This mechanism impacts gas reactions and ionic conductivity.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- Nanoscale geometry significantly alters material properties like reactivity and toxicity.
- Long-term effects of nanoparticle property changes, especially under atmospheric conditions, are not fully understood.
Purpose of the Study:
- To investigate the oxidation of cuboid iron nanoparticles using high-resolution microscopy.
- To understand the role of nanoscale geometry and strain in nanoparticle reactions.
Main Methods:
- Aberration-corrected scanning transmission electron microscopy (STEM).
- Atomic-level strain analysis.
- Study of cuboid iron nanoparticle oxidation.
Main Results:
- Strain gradients in the oxide shell, induced by nanoparticle geometry, were observed.
- These strain gradients enhance the transport of diffusing species.
- Oxide domain formation and nanoparticle shape evolution were driven by this mechanism.
Conclusions:
- Strain-gradient-enhanced mass transport is crucial for understanding nanoparticle reactions with gases.
- This mechanism provides insight into ionic conductivity in strained nanostructures.
- Nanoparticle geometry plays a key role in material reactivity and long-term stability.
