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Structural characterisation of the silica and alumina Zener pinning phases in nanocrystalline CeO2 by Si-29 and Al-27 nuclear magnetic resonance
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O'Dell, L. A., Savin, S. L. P., Chadwick, A. V. (Alan V.) and Smith, Mark E. (2008) Structural characterisation of the silica and alumina Zener pinning phases in nanocrystalline CeO2 by Si-29 and Al-27 nuclear magnetic resonance. Journal of Nanoparticle Research, Vol.10 (No.8). pp. 1263-1270. doi:10.1007/s11051-007-9354-z ISSN 1388-0764.
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Official URL: http://dx.doi.org/10.1007/s11051-007-9354-z
Abstract
Nanocrystalline CeO2 samples have been manufactured using sol-gel techniques, containing either 15 % silica or 10 % alumina by weight to restrict growth of the ceria nanocrystals during annealing by Zener pinning. Si-29 and Al-27 MAS NMR have been used to investigate the structure of these pinning phases over a range of annealing temperatures up to 1000 degrees C, and their effect on the CeO2 morphology has been studied using electron microscopy. The silica pinning phase resulted in CeO2 nanocrystals of average diameter 19 nm after annealing at 1000 degrees C, whereas the alumina pinned nanocrystals grew to 88 nm at the same temperature. The silica pinning phase was found to contain a significant amount of inherent disorder indicated by the presence of lower n Q(n) species even after annealing at 1000 degrees C. The alumina phase was less successful at restricting the growth of the ceria nanocrystals, and tended to separate into larger agglomerations of amorphous alumina, which crystallised to a transition alumina phase at higher temperatures.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Nanocrystals, Nanostructured materials, Cerium oxide, Nuclear magnetic resonance, Colloids, Silica, Aluminum oxide | ||||
Journal or Publication Title: | Journal of Nanoparticle Research | ||||
Publisher: | Springer Netherlands | ||||
ISSN: | 1388-0764 | ||||
Official Date: | December 2008 | ||||
Dates: |
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Volume: | Vol.10 | ||||
Number: | No.8 | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 1263-1270 | ||||
DOI: | 10.1007/s11051-007-9354-z | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), University of Warwick | ||||
Grant number: | GR/S61881 (EPSRC), GR/S61898 (EPSRC) |
Data sourced from Thomson Reuters' Web of Knowledge
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