Magnetite-cobalt ferrite nanoparticles for kerosene-based magnetic fluids
Due to the magnetic anisotropy introduced by the Co2+ ion in octahedral sites of cubic spinel ferrites, it is possible to tailor the magnetic properties by changing the cobalt content. Magnetic fluids with magnetite-cobalt ferrite nanoparticles given by the formula Co(x)Fe(3-x)O4 with x = 0, 0.2 and...
| Autor: | |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión enviada para evaluación y publicación |
| Fecha de publicación: | 2005 |
| País: | México |
| Institución: | Centro de Investigación en Materiales Avanzados |
| Repositorio: | Fuente de Objetos Científicos Open Access del CIMAV |
| OAI Identifier: | oai:cimav.repositorioinstitucional.mx:1004/1002 |
| Acceso en línea: | http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1002 |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/kerosene/Cobalt info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/22 info:eu-repo/classification/cti/2299 info:eu-repo/classification/cti/229999 |
| Sumario: | Due to the magnetic anisotropy introduced by the Co2+ ion in octahedral sites of cubic spinel ferrites, it is possible to tailor the magnetic properties by changing the cobalt content. Magnetic fluids with magnetite-cobalt ferrite nanoparticles given by the formula Co(x)Fe(3-x)O4 with x = 0, 0.2 and 0.4 were prepared. Kerosene and oleic acid were used as liquid carrier and surfactant, respectively. Spherical magnetic nanoparticles were obtained by coprecipitation from metal salts and ammonium hydroxide; afterwards the magnetic fluids were obtained by a peptization process. Powder properties were characterized by X-ray diffraction (XRD), nitrogen adsorption–desorption isotherma (BET), vibrating sample magnetometry (VSM) and fluids by transmission electron microscopy (TEM), thermogravimetric analyzer (TGA), VSM and the short-circuited transmission line technique. |
|---|