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Título

Aggregation state and magnetic properties of magnetite nanoparticles controlled by an optimized silica coating

AutorPérez, Nicolás; Moya, C.; Tartaj, Pedro CSIC ORCID ; Labarta, Amilcar; Batlle, X.
Fecha de publicación26-ene-2017
EditorAmerican Institute of Physics
CitaciónJournal of Applied Physics 121(4): 044304 (2017)
ResumenThe control of magnetic interactions is becoming essential to expand/improve the applicability of magnetic nanoparticles (NPs). Here, we show that an optimized microemulsion method can be used to obtain homogenous silica coatings on even single magnetic nuclei of highly crystalline FeO NPs (7 and 16 nm) derived from a high-temperature method. We show that the thickness of this coating is controlled almost at will allowing much higher average separation among particles as compared to the oleic acid coating present on pristine NPs. Magnetic susceptibility studies show that the thickness of the silica coating allows the control of magnetic interactions. Specifically, as this effect is better displayed for the smallest particles, we show that dipole-dipole interparticle interactions can be tuned progressively for the 7 nm NPs, from almost non-interacting to strongly interacting particles at room temperature. The quantitative analysis of the magnetic properties unambiguously suggests that dipolar interactions significantly broaden the effective distribution of energy barriers by spreading the distribution of activation magnetic volumes.
Versión del editorhttps://doi.org/10.1063/1.4974532
URIhttp://hdl.handle.net/10261/188533
DOI10.1063/1.4974532
Identificadoresdoi: 10.1063/1.4974532
e-issn: 1089-7550
issn: 0021-8979
Aparece en las colecciones: (ICMM) Artículos




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