The environmental aging of functional iron oxide nanomaterials, especially those used in biomedical applications, may have significant consequences for both their mechanism of action and their safety profile. However, to date, there has been no way to systematically measure this property, and the problem has been largely overlooked. We show here that a recently proposed “center of gravity” method for determining the composition of magnetite (Fe3O4) and maghemite (γ-Fe2O3) mixtures via 57Fe Mössbauer spectroscopy can be applied to the matter. We show that a long-established diffusion model can be used to characterize the oxidative aging process, yielding a parametric (and therefore predictive) description of the magnetite-to-maghemite oxidation processes occurring within the nanoparticles.
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Environmental oxidative aging of iron oxide nanoparticles
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24 September 2018
Research Article|
September 25 2018
Environmental oxidative aging of iron oxide nanoparticles
Lara K. Bogart;
Lara K. Bogart
1
UCL Healthcare Biomagnetics Laboratory, University College London
, 21 Albemarle Street, London W1S 4BS, United Kingdom
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Cristina Blanco-Andujar;
Cristina Blanco-Andujar
1
UCL Healthcare Biomagnetics Laboratory, University College London
, 21 Albemarle Street, London W1S 4BS, United Kingdom
2
MediSieve Limited, Translation and Innovation Hub
, 80 Wood Lane, London W12 0BZ, United Kingdom
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Quentin A. Pankhurst
Quentin A. Pankhurst
a)
1
UCL Healthcare Biomagnetics Laboratory, University College London
, 21 Albemarle Street, London W1S 4BS, United Kingdom
a)Author to whom correspondence should be addressed: q.pankhurst@ucl.ac.uk
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a)Author to whom correspondence should be addressed: q.pankhurst@ucl.ac.uk
Appl. Phys. Lett. 113, 133701 (2018)
Article history
Received:
July 28 2018
Accepted:
September 04 2018
Citation
Lara K. Bogart, Cristina Blanco-Andujar, Quentin A. Pankhurst; Environmental oxidative aging of iron oxide nanoparticles. Appl. Phys. Lett. 24 September 2018; 113 (13): 133701. https://doi.org/10.1063/1.5050217
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