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Learning from Nature to Improve the Heat Generation of Iron-Oxide Nanoparticles for Magnetic Hyperthermia Applications
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Learning from Nature to Improve the Heat Generation of Iron-Oxide Nanoparticles for Magnetic Hyperthermia Applications
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Journal Article
Learning from Nature to Improve the Heat Generation of Iron-Oxide Nanoparticles for Magnetic Hyperthermia Applications
2013
Overview
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.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ Biomimetic Materials - chemistry
/ Biomimetic Materials - radiation effects
/ Cancer
/ Fever
/ Heating
/ Humanities and Social Sciences
/ Hyperthermia, Induced - methods
/ Iron
/ Magnetite Nanoparticles - chemistry
/ Magnetite Nanoparticles - radiation effects
/ Magnetite Nanoparticles - therapeutic use
/ Magnetosomes - radiation effects
/ Science
