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Fluoride doped γ-Fe2O3 nanoparticles with increased MRI relaxivity

Jones, N. E.; Burnett, C. A.; Salamon, S.; Landers, J.; Wende, H.; Lazzarini, L.; Gibbs, P.; Pickles, M.; Johnson, B. R.G.; Evans, D. J.; Archibald, S. J.; Francesconi, M. G.

Authors

N. E. Jones

C. A. Burnett

S. Salamon

J. Landers

H. Wende

L. Lazzarini

P. Gibbs

M. Pickles

B. R.G. Johnson

D. J. Evans



Abstract

Iron oxide nanoparticles (IONs) are being actively researched and experimented with as contrast agents for Magnetic Resonance Imaging (MRI), as well as image-directed delivery of therapeutics. The efficiency of an MRI contrast agent can be described by its longitudinal and transverse relaxivities, r 1 and r 2 . γ-Fe 2 O 3 nanoparticles-doped with fluoride in a controlled manner and functionalised with citric acid-showed a 3-fold increase in r 1 and a 17-fold increase in r 2 in a magnetic field of 3 T and almost 6-fold increase in r 1 and a 14-fold increase in r 2 at 11 T. Following fluorination, PXRD shows that the crystal structure of γ-Fe 2 O 3 is maintained, Mössbauer spectroscopy shows that the oxidation state of the Fe cation is unchanged and HREM shows that the particle size does not vary. However, magnetisation curves show a large increase in the coercive field, pointing towards a large increase in the magnetic anisotropy for the fluorinated nanoparticles compared to the un-doped γ-Fe 2 O 3 nanoparticles. Therefore, a chemically induced increase in magnetic anisotropy appears to be the most relevant parameter responsible for the large increase in relaxivity for γ-Fe 2 O 3 nanoparticles.

Journal Article Type Article
Publication Date Apr 4, 2018
Journal Journal of Materials Chemistry B
Print ISSN 2050-750X
Electronic ISSN 2050-750X
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 6
Issue 22
Pages 3665-3673
APA6 Citation Jones, N. E., Burnett, C. A., Salamon, S., Landers, J., Wende, H., Lazzarini, L., …Francesconi, M. G. (2018). Fluoride doped γ-Fe2O3 nanoparticles with increased MRI relaxivity. Journal of Materials Chemistry B, 6(22), 3665-3673. https://doi.org/10.1039/c8tb00360b
DOI https://doi.org/10.1039/c8tb00360b
Keywords General Materials Science; General Chemistry; Biomedical Engineering; General Medicine
Publisher URL http://pubs.rsc.org/en/Content/ArticleLanding/2018/TB/C8TB00360B#!divAbstract
Copyright Statement ©2018 The University of Hull
Additional Information : This document is Similarity Check deposited; : C. A. Burnett (ORCID); : C. A. Burnett (ResearcherID); : S. Salamon (ORCID); : J. Landers (ORCID); : H. Wende (ORCID); : B. R. G. Johnson (ORCID); : M. G. Francesconi (ORCID); : Single-blind; : Received 5 February 2018; Accepted 28 March 2018; Accepted Manuscript published 4 April 2018; Advance Article published 9 April 2018

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