Cobalt-containing core-shell nanoparticles on the surface of poly(tetrafluoroethylene) microgranules
| Autor: | S. A. Moksin, O. V. Shvachko, S. P. Gubin, T. I. Nedoseikina, G. Yu. Yurkov, Yu. A. Koksharov, A. V. Kozinkin, Dmitry Baranov |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
General Chemical Engineering Thermal decomposition Metals and Alloys Analytical chemistry Nanoparticle chemistry.chemical_element Nanomaterials law.invention Inorganic Chemistry chemistry.chemical_compound chemistry Chemical engineering Transmission electron microscopy law Materials Chemistry Tetrafluoroethylene Absorption (chemistry) Electron paramagnetic resonance Cobalt |
| Zdroj: | Inorganic Materials. 42:1012-1019 |
| ISSN: | 1608-3172 0020-1685 |
| DOI: | 10.1134/s0020168506090159 |
| Popis: | Cobalt-containing nanoparticles have been prepared via thermal decomposition of cobalt acetate on the surface of poly(tetrafluoroethylene) (PTFE) microgranules forming a fluidized bed over the surface of hot mineral oil. Using transmission electron microscopy, the average size of the cobalt-containing nanoparticles has been determined to be 3.6 nm. The composition and structure of the nanoparticles have been determined by x-ray diffraction, extended x-ray absorption fine structure spectroscopy, and electron paramagnetic resonance, and the magnetic properties of the synthesized nanomaterial have been studied. The results indicate that the nanoparticles have a core-shell structure, with a metallic cobalt core (≃10 vol%) and a shell consisting of three phases: Co3O4 (≃80%) and small amounts of CoO and CoF2 (≃10%). The fluoride phase results from the interaction of the nanoparticles with surface fluorine atoms of the PTFE microgranules. |
| Databáze: | OpenAIRE |
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