Synthesis and magnetic characterization of magnetite particles embedded in mesoporous MCM-41
A solid of 7.7 wt% iron-loaded MCM-41 was obtained by impregnating the mesoporous material with an Fe-carrying organic salt after subjecting the matrix to a silylation treatment. The Mössbauer and magnetic results show that the as-prepared composite is mainly made up of fine Fe3O4 particles that dis...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2006 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/57688 |
| Acceso en línea: | http://hdl.handle.net/11336/57688 |
| Access Level: | acceso abierto |
| Palabra clave: | Chemical Synthesis Fe3o4 Magnetic Nanoarrays Synthesis Magnetically Ordered Materials Mcm-41 Nanofabrications Nanoparticles Magnetism Nanostructures Silylated Mcm-41 https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| Sumario: | A solid of 7.7 wt% iron-loaded MCM-41 was obtained by impregnating the mesoporous material with an Fe-carrying organic salt after subjecting the matrix to a silylation treatment. The Mössbauer and magnetic results show that the as-prepared composite is mainly made up of fine Fe3O4 particles that display a superparamagnetic relaxation at room temperature and block at ≈42 K. A percentage of ≈24% of the iron-containing phases is magnetically blocked at room temperature, and belongs to Fe3O4 that undergoes the Verwey transition. In addition, there is a minor Fe(III) phase that remains paramagnetic down to 4.2 K. © 2006 Elsevier B.V. All rights reserved. |
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