NDLI: Insights into the structure and thermal stability of uranyl aluminate nanoparticles

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Back cover

New Journal of Chemistry Vol - 41 Issue - 2

New Journal of Chemistry Vol - 41 Issue - 1

New Journal of Chemistry Vol -39

New Journal of Chemistry Vol -29

New Journal of Chemistry Vol -0

Insights into the structure and thermal stability of uranyl aluminate nanoparticles

Content Provider	Royal Society of Chemistry (RSC)
Author	Goff, Xavier Le Nikitenko, Sergey I. Chave, Tony Scheinost, Andreas C.
Copyright Year	2017
Abstract	Ultrasonically assisted hydrolytic precipitation of U(VI) in the presence of mesoporous alumina followed by thermal treatment of a solid precursor enabled the formation of crystallized uranyl aluminate (URAL) nanoparticles (NPs) dispersed in the alumina matrix. The effect of U(VI) concentration and calcination temperature on the yield of URAL NPs was studied using XRD, XAFS and HRTEM techniques. At 800 °C, URAL NPs (d ≈ 5 nm) are formed only for a low uranium loading of about 5 wt% whereas for a higher content of uranium, larger U3O8 NPs (d ≈ 20 nm) were identified as the principal uranium species. At 500 °C, URAL NPs are formed even for 25 wt% of uranium. The U LIII edge EXAFS spectra pointed out that uranyl cations in URAL are coordinated by bidentate aluminate groups. Presumably URAL is formed during the heating of the 2UO3·NH3·2H2O/AlO(OH) precursor. However, high temperature and higher content of uranium promote transformation of URAL to more thermodynamically stable U3O8. This process is accompanied by the growth of uranium NPs via the Ostwald ripening mechanism.
Starting Page	1160
Ending Page	1167
Page Count	8
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	41
Issue Number	3
Journal	New Journal of Chemistry
DOI	10.1039/c6nj02948e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Aluminium oxide Ural Mountains Extended X-ray absorption fine structure Calcination Composite material X-ray crystallography Ostwald Mesoporous material Ammonia Uranium Ostwald ripening Denticity Aluminate Uranium oxide Uranyl
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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