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



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Gonzalez Fernandez, M. A. and Torres, T. and Andrés Vergés, M. and Costo, R. and Presa Muñoz del Toro, Patricia de la and Serna, C. J. and Morales, M. P. and Marquina, C. and Ibarra, M. R. and Goya, G. F. (2009) Magnetic Nanoparticles for Power Absorption: optimizing size, shape and magnetic properties. Journal of solid state chemistry, 182 (10). pp. 2779-2784. ISSN 0022-4596

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We present a Study on the magnetic properties of naked and silica-coated Fe₃O₄nanoparticles 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 SiO₂shell 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 SiO₂functional coating as thin as possible.

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The authors acknowledge the financial support from Diputación General de Aragón, Comunidad de Madrid (S-0505/MAT/0194), and Ministerio de Ciencia e Innovación (MAT2005-03179 and MAT2008-01489). GFG and PP acknowledge support from the Spanish MEC through the Ramon y Cajal program.

Uncontrolled Keywords:Cancer-therapy; Gamma-Fe₂O₃ particles; Stability; Agents; Field
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:45511
Deposited On:30 Nov 2017 19:18
Last Modified:11 Dec 2017 15:28

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