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- W1980002010 abstract "Abstract We describe the synthesis of cerium, thorium and uranium oxide nanoparticles embedded in a mesoporous matrix as template in a kind of nanocasting technique. The solid matrix is used as a template to obtain and stabilize the actinide oxide nanoparticles. We apply high resolution transmission electron microscopy (HR-TEM) to show evidence of metal oxide incorporation into the matrix pores and analyze their structure. Measured interplanar distances and calculated lattice parameters for synthesized nanosized CeO 2− x and ThO 2 samples differ from their bulk crystalline counterparts. We obtain with our synthesis CeO 2− x particles containing both Ce 4+ and larger sized Ce 3+ . The lattice parameter for these ceria nanoparticles is found to be larger than the bulk value due to the presence of Ce 3+ with its larger ionic radius. The presence of Ce 3+ was established by means of high resolution X-ray emission spectroscopy (HRXES), applied to the investigation of nanoparticles for the first time. The ThO 2 nanoparticles exhibit a decrease in interplanar distances, as one might generally expected for these nanoclusters. However, the lattice distance decrease for our particles is remarkable, up to 5%, indicating that contact with the surrounding silica matrix may exert a bond distance shortening effect such as through significant external pressure on the particle surface." @default.
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- W1980002010 date "2013-03-19" @default.
- W1980002010 modified "2023-10-17" @default.
- W1980002010 title "Synthesis and characterization of thorium, uranium and cerium oxide nanoparticles" @default.
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- W1980002010 doi "https://doi.org/10.1524/ract.2012.2014" @default.
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