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• W2151449706 abstract "Abstract Developing an understanding of the reaction processes occurring at the surface⿿fluid interface at the atomic level of nanostructured materials in high-temperature aqueous environments is necessary for establishing general principles of behavior of nanomaterials operating in such extremes. In situ Co K-edge X-ray absorption spectroscopy (XAS) measurements were made on Fe3O4 nanoparticles in the presence of Co2+ ions in aqueous fluids to 500 °C and approximately 220 MPa. The results from analysis of the in situ EXAFS data, along with SEM-EDX spectra measured from reacted nanoparticles, indicate that adsorption of Co2+ ions on the surface of Fe3O4 nanoparticles is negligible at temperatures below 200 °C but becomes significant in the 250⿿500 °C temperature range. The low reaction temperature threshold of the Co2+ aqua ion with Fe3O4 nanoparticles is consistent with a relatively low value of the crystal field stabilization energy (CFSE) of Co2+ in octahedral site symmetry in spinels. Modeling of the pre-edge feature of the XANES and analysis of the extended X-ray absorption fine structure (EXAFS) shows that Co2+ adsorbs predominantly on octahedral sites of the surface of nanoparticles in aqueous fluids. Structural analyses using EXAFS and high resolution TEM show that the inverse spinel structure is preserved in the Co-incorporated surface atomic layers of the Fe3O4 nanoparticles. Our results suggest that the dissolved radioactive isotope 60Co in the primary cooling loop of supercritical water-cooled nuclear reactors have a high likelihood of precipitating on the surfaces of spalled ferrite nanomaterial." @default.
• W2151449706 created "2016-06-24" @default.
• W2151449706 creator A5059023467 @default.
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• W2151449706 date "2013-09-01" @default.
• W2151449706 modified "2023-09-27" @default.
• W2151449706 title "In situ monitoring of the adsorption of Co2+ on the surface of Fe3O4 nanoparticles in high-temperature aqueous fluids" @default.
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• W2151449706 doi "https://doi.org/10.1016/j.supflu.2013.05.017" @default.
• W2151449706 hasPublicationYear "2013" @default.
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