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

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

2009-01-25

arxiv.org/abs/0901.3891v1

Physics

Condensed Matter

Materials Science

15 pages, 7 figures, 2 tables

Scientific paper

We present a study on the magnetic properties of naked and silica-coated Fe3O4 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 SiO2 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 SiO2 functional coating as thin as possible.

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