Journal
INORGANIC CHEMISTRY FRONTIERS
Volume 8, Issue 4, Pages 1102-1110Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0qi01140a
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Funding
- European Commission Council under ERC [759696]
- RFBR [19-33-90127]
- Russian Ministry of Science and Education [075-15-2019-1891]
- Swedish Research Council [2017-06465]
- Swedish Research Council [2017-06465] Funding Source: Swedish Research Council
- European Research Council (ERC) [759696] Funding Source: European Research Council (ERC)
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Highly crystalline UO2 nanoparticles with sizes of 2-3 nm were produced by fast chemical deposition under reducing conditions. Despite being initially in U(IV) oxidation state, the nanoparticles oxidize to U4O9 over time and under X-ray beam. This oxidation process is accompanied by growth in size to 6 nm. The properties of UO2 nanoparticles are compared to PuO2, ThO2, and CeO2 nanoparticles in terms of both differences and similarities.
Highly crystalline UO2 nanoparticles (NPs) with sizes of 2-3 nm were produced by fast chemical deposition of uranium(iv) under reducing conditions at pH 8-11. The particles were then characterized by microscopy and spectroscopy techniques including high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), high-energy resolution fluorescence detection (HERFD) X-ray absorption spectroscopy at the U M-4 edge and extended X-ray absorption fine structure (EXAFS) spectroscopy at the U L-3 edge. The results of this investigation show that despite U(iv) being the dominant oxidation state of the freshly prepared UO2 NPs, they oxidize to U4O9 with time and under the X-ray beam, indicating the high reactivity of U(iv) under these conditions. Moreover, it was found that the oxidation process of NPs is accompanied by their growth in size to 6 nm. We highlight here the major differences and similarities of the UO2 NP properties to PuO2, ThO2 and CeO2 NPs.
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