Synthesis and characterization of nanoparticulate MnS within the pores of mesoporous silica
| Autor: | Michael A. Morris, Justin D. Holmes, Olga Kazakova, Mark Copley, David J. Otway, Louse Barry |
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| Rok vydání: | 2007 |
| Předmět: |
Materials science
Passivation chemistry.chemical_element Nanoparticle Nanotechnology Manganese Mesoporous silica Condensed Matter Physics Microstructure Electronic Optical and Magnetic Materials Inorganic Chemistry Chemical engineering Pulmonary surfactant chemistry Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Luminescence Mesoporous material |
| Zdroj: | Journal of Solid State Chemistry. 180:3443-3449 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2007.10.004 |
| Popis: | Mesoporous silica was loaded with nanoparticulate MnS via a simple post-synthesis treatment. The mesoporous material that still contained surfactant was passivated to prevent MnS formation at the surface. The surfactant was extracted and a novel manganese ethylxanthate was used to impregnate the pore network. This precursor thermally decomposes to yield MnS particles that are smaller or equal to the pore size. The particles exhibit all three common polymorphs. The passivation treatment is most effective at lower loadings because at the highest loadings (SiO 2 :MnS molar ratio of 6:1) large particles (>50 nm) form at the exterior of the mesoporous particles. The integrity of the mesoporous network is maintained through the preparation and high order is maintained. The MnS particles exhibit unexpected ferromagnetism at low temperatures. Strong luminescence of these samples is observed and this suggests that they may have a range of important application areas. |
| Databáze: | OpenAIRE |
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