Magnetic Nanoparticles for Power Absorption: optimizing size, shape and magnetic properties.

By M. A. González-Fernández, T. Torres, M. Andrés-Vergés, R. Costo, P. Presa, C. Serna, M. Morales, C. Marquina, M. Ibarra, G. Goya. 2009

161 citations recorded by the source corpus.

We present a study on the magnetic properties of naked and silica-coated Fe{sub 3}O{sub 4} nanoparticles with sizes between 5 and 110 nm. Their efficiency as heating agents was assessed through specific power absorption (SPA) measurements as a function of particle size and shape. The results show a strong dependence of the SPA with the particle size, with a maximum around 30 nm, as expected for a Neel relaxation mechanism in single-domain particles. The SiO{sub 2} shell thickness was found to play an important role in the SPA mechanism by hindering the heat outflow, thus decreasing the heating efficiency. It is concluded that a compromise between good heating efficiency and surface functionality for biomedical purposes can be attained by making the SiO{sub 2} functional coating as thin as possible. - Graphical Abstract: The magnetic properties of Fe{sub 3}O{sub 4} nanoparticles from 5 to 110 nm are presented, and their efficiency as heating agents discussed as a function of particle size, shape and surface functionalization.

Subfields: Biomaterials, Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/bf74fb3644c0720aea7c4843ed2f994f7ccebdbc

Citations in the corpus

• Superparamagnetic iron oxide nanoparticles: magnetic nanoplatforms as drug carriers (2012, unknown): “104 Magnetoliposomes have also emerged as an effective tool for producing localized hyperthermia together with delivery of encapsulated drugs to the target site, resulting in the destruction of cancerous cells.”