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Ultra-thin MgO coating of superparamagnetic magnetite nanoparticles by combined co-precipitation and sol-gel synthesis

AuthorsMatteis, Laura de; Custardoy, Laura; Fernández-Pacheco, Rodrigo; Magen, Cesar; Fuente, Jesús M. de la; Ibarra, M. Ricardo; Marquina, Clara
Issue Date2012
CitationICM 2012
AbstractSuperparamagnetic magnetite nanoparticles coated with an ultra-thin (~1 nm) magnesium oxide (MgO) layer have been synthesized by combining co-precipitation and sol-gel methods. A thorough chemical and structural characterization has been carried out by means of HRTEM, XRD, EDS, DLS and TGA. Aberration corrected HRTEM experiments with sub-angstrom spatial resolution have allowed us to distinguish the ultrathin MgO shell that grows epitaxially on the magnetic cores. The capability of the MgO shell to protect the magnetic nuclei from oxidation up to 600ºC has been demonstrated. The magnetic properties of the material have been studied before and after the coating procedure. The superparamagnetism of the magnetite nuclei at room temperature is preserved even after calcination. The possibility of obtaining particles of controlled size coated with an isolating layer of nanometric thickness and high thermal stability makes the combination of the two synthesis methods used in this work a starting procedure to obtain nanometric powders suitable for technological applications, such as high-frequency electronics. These particles, after the appropriated functionalization, are also potential candidates to be used in biomedical applications.
DescriptionResumen del póster presentado a la 19th International Conference on Magnetism celebrada en Korea del 8 al 13 de julio de 2012.
Appears in Collections:(ICMA) Comunicaciones congresos
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