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dc.contributor.authorDeng, Bing
Advincula, Paul A.
Luong, Duy Xuan
Zhou, Jingan
Zhang, Boyu
Wang, Zhe
McHugh, Emily A.
Chen, Jinhang
Carter, Robert A.
Kittrell, Carter
Lou, Jun
Zhao, Yuji
Yakobson, Boris I.
Zhao, Yufeng
Tour, James M.
dc.date.accessioned 2022-09-29T15:06:38Z
dc.date.available 2022-09-29T15:06:38Z
dc.date.issued 2022
dc.identifier.citation Deng, Bing, Advincula, Paul A., Luong, Duy Xuan, et al.. "High-surface-area corundum nanoparticles by resistive hotspot-induced phase transformation." Nature Communications, 13, (2022) Springer Nature: https://doi.org/10.1038/s41467-022-32622-4.
dc.identifier.urihttps://hdl.handle.net/1911/113448
dc.description.abstract High-surface-area α-Al2O3 nanoparticles are used in high-strength ceramics and stable catalyst supports. The production of α-Al2O3 by phase transformation from γ-Al2O3 is hampered by a high activation energy barrier, which usually requires extended high-temperature annealing (~1500 K, > 10 h) and suffers from aggregation. Here, we report the synthesis of dehydrated α-Al2O3 nanoparticles (phase purity ~100%, particle size ~23 nm, surface area ~65 m2 g−1) by a pulsed direct current Joule heating of γ-Al2O3. The phase transformation is completed at a reduced bulk temperature and duration (~573 K, < 1 s) via an intermediate δʹ-Al2O3 phase. Numerical simulations reveal the resistive hotspot-induced local heating in the pulsed current process enables the rapid transformation. Theoretical calculations show the topotactic transition (from γ- to δʹ- to α-Al2O3) is driven by their surface energy differences. The α-Al2O3 nanoparticles are sintered to nanograined ceramics with hardness superior to commercial alumina and approaching that of sapphire.
dc.language.iso eng
dc.publisher Springer Nature
dc.rights 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.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.title High-surface-area corundum nanoparticles by resistive hotspot-induced phase transformation
dc.type Journal article
dc.citation.journalTitle Nature Communications
dc.contributor.org Smalley-Curl Institute
dc.contributor.org NanoCarbon Center
dc.contributor.org Welch Institute for Advanced Materials
dc.citation.volumeNumber 13
dc.identifier.digital s41467-022-32622-4
dc.type.dcmi Text
dc.identifier.doihttps://doi.org/10.1038/s41467-022-32622-4
dc.type.publication publisher version
dc.citation.articleNumber 5027


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