Resumo

CANO, M.E.; MEDINA, R.H.; FERNANDEZ, V.V.A.  e  GARCIA-CASILLAS, P.E.. Magnetic heating ability of silica-cobalt ferrite nanoparticles. Rev. Mex. Ing. Quím [online]. 2014, vol.13, n.2, pp.555-561. ISSN 1665-2738.

In this study, the magnetic induction heating of cobalt ferrite nanoparticles with or without silica coating was analyzed for evaluating the feasibility of these materials to be used for magnetic hyperthermia. Particles of approximately 14 and 40 run were evaluated. For this purpose, we used a magnetic induction system to obtain the specific absorption rate (SAR) values. Two different amplitudes of 35 mT and 63 mT at 180 kHz were used. Our results showed the smaller particles exhibiting the higher SAR value, independent of the intensities applied. Moreover, there was no significant change in the SAR values for both particle sizes in presence of silica. However, silica increased the hydrolytic degradation.

Palavras-chave : cobalt ferrite; hyperthermia; magnetic induction; nanomaterials; ferromagnetism.