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The self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles

Nanosizing can dramatically alter material properties by enhancing surface thermodynamic contributions, shortening diffusion lengths, and increasing the number of catalytically active sites per unit volume. These mechanisms have been used to explain the improved properties of catalysts, battery mate...

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Autores principales: Ulvestad, A., Yau, A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5680230/
https://www.ncbi.nlm.nih.gov/pubmed/29123126
http://dx.doi.org/10.1038/s41467-017-01548-7
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author Ulvestad, A.
Yau, A.
author_facet Ulvestad, A.
Yau, A.
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description Nanosizing can dramatically alter material properties by enhancing surface thermodynamic contributions, shortening diffusion lengths, and increasing the number of catalytically active sites per unit volume. These mechanisms have been used to explain the improved properties of catalysts, battery materials, plasmonic materials, etc. Here we show that Pd nanoparticles also have the ability to self-heal defects in their crystal structures. Using Bragg coherent diffractive imaging, we image dislocations nucleated deep in a Pd nanoparticle during the forward hydriding phase transformation that heal during the reverse transformation, despite the region surrounding the dislocations remaining in the hydrogen-poor phase. We show that defective Pd nanoparticles exhibit sloped isotherms, indicating that defects act as additional barriers to the phase transformation. Our results resolve the formation and healing of structural defects during phase transformations at the single nanoparticle level and offer an additional perspective as to how and why nanoparticles differ from their bulk counterparts.
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spelling pubmed-56802302017-11-15 The self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles Ulvestad, A. Yau, A. Nat Commun Article Nanosizing can dramatically alter material properties by enhancing surface thermodynamic contributions, shortening diffusion lengths, and increasing the number of catalytically active sites per unit volume. These mechanisms have been used to explain the improved properties of catalysts, battery materials, plasmonic materials, etc. Here we show that Pd nanoparticles also have the ability to self-heal defects in their crystal structures. Using Bragg coherent diffractive imaging, we image dislocations nucleated deep in a Pd nanoparticle during the forward hydriding phase transformation that heal during the reverse transformation, despite the region surrounding the dislocations remaining in the hydrogen-poor phase. We show that defective Pd nanoparticles exhibit sloped isotherms, indicating that defects act as additional barriers to the phase transformation. Our results resolve the formation and healing of structural defects during phase transformations at the single nanoparticle level and offer an additional perspective as to how and why nanoparticles differ from their bulk counterparts. Nature Publishing Group UK 2017-11-09 /pmc/articles/PMC5680230/ /pubmed/29123126 http://dx.doi.org/10.1038/s41467-017-01548-7 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Ulvestad, A.
Yau, A.
The self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles
title The self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles
title_full The self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles
title_fullStr The self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles
title_full_unstemmed The self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles
title_short The self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles
title_sort self-healing of defects induced by the hydriding phase transformation in palladium nanoparticles
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5680230/
https://www.ncbi.nlm.nih.gov/pubmed/29123126
http://dx.doi.org/10.1038/s41467-017-01548-7
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