Specific Power Absorption of Silica-coated Magnetite Cubes
Gema Marcelo, Fernando Catalina, Ignacio J. Bruvera, Clara Marquina and Gerardo F. Goya
Affiliation: Instituto de Ciencia y Tecnología de Polímeros (ICTP-CSIC), Juan de la Cierva 3, 28006 (Madrid), Spain.
Keywords: Iron (III) acetylacetonate, ferromagnetic, magnetic hyperthermia, magnetite nanocubes, silica modification.
We have developed silica stabilized ferrimagnetic magnetite nanocubes (MNCs) as effective heat mediators for
magnetic hyperthermia. To do that, large hydrophobic magnetite nanoparticles, with a mean size of 79 and 124 nm were
synthesized and transferred to water by silica surface modification. The heating ability of these water suspensions was
studied by measuring the Specific Power Absorption (SPA) applying an AC magnetic field of amplitude H0 = 45 kA/m
and frequency f = 360 kHz. High SPA values were obtained, ranging from 560 to 1160 W/g. The normalization of the
SPA values by the inverse of the frequency and squared field amplitude was performed in order to compare our results
with these described in literature. The SPA value for our samples, normalized in this way, yielded values of 0.7-1.5 nH
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