High-surface-area corundum nanoparticles by resistive hotspot-induced phase transformation

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dc.citation.articleNumber5027
dc.citation.journalTitleNature Communications
dc.citation.volumeNumber13
dc.contributor.authorDeng, Bing
dc.contributor.authorAdvincula, Paul A.
dc.contributor.authorLuong, Duy Xuan
dc.contributor.authorZhou, Jingan
dc.contributor.authorZhang, Boyu
dc.contributor.authorWang, Zhe
dc.contributor.authorMcHugh, Emily A.
dc.contributor.authorChen, Jinhang
dc.contributor.authorCarter, Robert A.
dc.contributor.authorKittrell, Carter
dc.contributor.authorLou, Jun
dc.contributor.authorZhao, Yuji
dc.contributor.authorYakobson, Boris I.
dc.contributor.authorZhao, Yufeng
dc.contributor.authorTour, James M.
dc.contributor.orgSmalley-Curl Institute
dc.contributor.orgNanoCarbon Center
dc.contributor.orgWelch Institute for Advanced Materials
dc.date.accessioned2022-09-29T15:06:38Z
dc.date.available2022-09-29T15:06:38Z
dc.date.issued2022
dc.description.abstractHigh-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.identifier.citationDeng, Bing, Advincula, Paul A., Luong, Duy Xuan, et al.. "High-surface-area corundum nanoparticles by resistive hotspot-induced phase transformation." <i>Nature Communications,</i> 13, (2022) Springer Nature: https://doi.org/10.1038/s41467-022-32622-4.
dc.identifier.digitals41467-022-32622-4
dc.identifier.doihttps://doi.org/10.1038/s41467-022-32622-4
dc.identifier.urihttps://hdl.handle.net/1911/113448
dc.language.isoeng
dc.publisherSpringer Nature
dc.rightsThis 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.titleHigh-surface-area corundum nanoparticles by resistive hotspot-induced phase transformation
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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