Unexpected Fe local order in iron oxide-coated nanocrystalline magnesium oxides with exceptional reactivities against environmental toxins
| Autor: | Shawn Decker, Jacques Moscovici, Kenneth J. Klabunde, Mouad Benzakour, Corrie L. Carnes, Alain Michalowicz |
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| Rok vydání: | 2001 |
| Předmět: |
Air Pollutants
Nuclear and High Energy Physics Radiation Materials science Extended X-ray absorption fine structure Magnesium Inorganic chemistry Iron oxide Oxide Nanoparticle chemistry.chemical_element Ferric Compounds Nanocrystalline material X-ray absorption fine structure chemistry.chemical_compound Chlorides chemistry Magnesium Oxide Carbon Tetrachloride Instrumentation Reactive material |
| Zdroj: | Journal of Synchrotron Radiation. 8:925-927 |
| ISSN: | 0909-0495 |
| DOI: | 10.1107/s0909049500021038 |
| Popis: | Mg oxide nanoparticles are very reactive materials used to mitigate atmospheric pollution and to sequester polluting molecules. Using Fe K-edge XAFS, we have studied the structure of iron oxide-coated MgO nanoparticles before and after reaction with CCl4. Before reaction, the local structure around Fe is totally different from that in iron oxide coatings on SrO and CaO nanoparticles, although these coated materials were prepared in the same way. In SrO and CaO, the iron oxide coating has been shown to be well separated from the bulk of the nanoparticle, whereas in MgO, Fe was found to mix with MgO. After reaction with CCl4, Fe-Cl bonds can be detected when the coated nanoparticle is saturated. Such Fe-Cl EXAFS signals have not been observed in previously studied nanoparticles. |
| Databáze: | OpenAIRE |
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