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Learning form Nature to improve the heat generation of iron-oxide nanoparticles for magnetic hyperthermia applications.
Martinez-Boubeta, Carlos; Simeonidis, Konstantinos; Makridis, Antonios; Angelakeris, Makis; Iglesias, Òscar; Guardia, Pablo; Cabot i Codina, Andreu; Yedra Cardona, Lluís; Estradé Albiol, Sònia; Peiró Martínez, Francisca; Saghi, Zineb; Midgley, Paul A.; Conde-Leborán, Iván; Serantes, David; Baldomir, Daniel
Universitat de Barcelona
The performance of magnetic nanoparticles is intimately entwined with their structure, mean size and magnetic anisotropy. Besides, ensembles offer a unique way of engineering the magnetic response by modifying the strength of the dipolar interactions between particles. Here we report on an experimental and theoretical analysis of magnetic hyperthermia, a rapidly developing technique in medical research and oncology. Experimentally, we demonstrate that single-domain cubic iron oxide particles resembling bacterial magnetosomes have superior magnetic heating efficiency compared to spherical particles of similar sizes. Monte Carlo simulations at the atomic level corroborate the larger anisotropy of the cubic particles in comparison with the spherical ones, thus evidencing the beneficial role of surface anisotropy in the improved heating power. Moreover we establish a quantitative link between the particle assembling, the interactions and the heating properties. This knowledge opens new perspectives for improved hyperthermia, an alternative to conventional cancer therapies.
Càncer
Nanotecnologia
Nanopartícules
Propietats magnètiques
Materials magnètics
Calor
Terapèutica
Cancer
Nanotechnology
Nanoparticles
Magnetic properties
Magnetic materials
Heat
Therapeutics
cc-by-nc-nd (c) Martinez-Boubeta, Carlos et al., 2013
http://creativecommons.org/licenses/by-nc-nd/3.0/es
Artículo
info:eu-repo/semantics/publishedVersion
Nature Publishing Group
         

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