High performance multi-core iron oxide nanoparticles for magnetic hyperthermia: microwave synthesis, and the role of core-to-core interactions

The adoption of magnetic hyperthermia as either a stand-alone or adjunct therapy for cancer is still far from being optimised due to the variable performance found in many iron oxide nanoparticle systems, including commercially available formulations. Herein, we present a reproducible and potentiall...

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Bibliographic Details
Published in:Nanoscale 2015-01, Vol.7 (5), p.1768-1775
Main Authors: Blanco-Andujar, C, Ortega, D, Southern, P, Pankhurst, Q A, Thanh, N T K
Format: Article
Language:English
Subjects:
Citric acid
Citric Acid - chemistry
Equivalence
Ferrosoferric Oxide - chemistry
Heating
Hyperthermia
Hyperthermia, Induced
Iron oxides
Magnetic Fields
Magnetite Nanoparticles - chemistry
Microwaves
Nanoparticles
Nanostructure
Temperature
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Summary:The adoption of magnetic hyperthermia as either a stand-alone or adjunct therapy for cancer is still far from being optimised due to the variable performance found in many iron oxide nanoparticle systems, including commercially available formulations. Herein, we present a reproducible and potentially scalable microwave-based method to make stable citric acid coated multi-core iron oxide nanoparticles, with exceptional magnetic heating parameters, viz. intrinsic loss parameters (ILPs) of up to 4.1 nH m(2) kg(-1), 35% better than the best commercial equivalents. We also probe the core-to-core magnetic interactions in the particles via remanence-derived Henkel and ΔM plots. These reveal a monotonic dependence of the ILP on the magnetic interaction field Hint, and show that the interactions are demagnetising in nature, and act to hinder the magnetic heating mechanism.
ISSN:2040-3364
2040-3372
DOI:10.1039/c4nr06239f