title: Fe3O4 nanoparticles prepared by the seeded-growth route for hyperthermia: electron magnetic resonance as a key tool to evaluate size distribution in magnetic nanoparticles.
abstract: Monodispersed Fe3O4 nanoparticles have been synthesized by a thermal decomposition method based on the seeded-growth technique, achieving size tunable nanoparticles with high crystallinity and high saturation magnetization. EMR spectroscopy becomes a very efficient complementary tool to determine the fine details of size distributions of MNPs and even to estimate directly the size in a system composed of a given type of magnetic nanoparticles. The size and size dispersity affect directly the efficiency of MNPs for hyperthermia and EMR provides a direct evaluation of these characteristics almost exactly in the same preparation and with the same concentration as used in hyperthermia experiments. The correlation observed between the Specific Absorption Rate (SAR) and the effective gyromagnetic factor (geff) is extremely remarkable and renders a way to assess directly the heating capacity of a MNP system.
authors.affiliation: Dpto. de Química Inorgánica, Universidad del País Vasco UPV/EHU, P.O. Box. 644, E-48080, Bilbao, Spain. luis.lezama@ehu.es.
authors.forename: Idoia
authors.initials: I
authors.lastname: Castellanos-Rubio
authors.forename: Maite
authors.initials: M
authors.lastname: Insausti
authors.forename: Eneko
authors.initials: E
authors.lastname: Garaio
authors.forename: Izaskun
authors.initials: I
authors.lastname: Gil de Muro
authors.forename: Fernando
authors.initials: F
authors.lastname: Plazaola
authors.forename: Teófilo
authors.initials: T
authors.lastname: Rojo
authors.forename: Luis
authors.initials: L
authors.lastname: Lezama