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Influence of clustering on the magnetic properties and hyperthermia performance of iron oxide nanoparticles
University of Cantabria, Spain.
DTU Technical University of Denmark, Denmark.
DTU Technical University of Denmark, Denmark.
UCL University College London, UK.
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2018 (English)In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 29, no 42, article id 425705Article in journal (Refereed) Published
Abstract [en]

Clustering of magnetic nanoparticles can drastically change their collective magnetic properties, which in turn may influence their performance in technological or biomedical applications. Here, we investigate a commercial colloidal dispersion (FeraSpin™R), which contains dense clusters of iron oxide cores (mean size around 9 nm according to neutron diffraction) with varying cluster size (about 18-56 nm according to small angle x-ray diffraction), and its individual size fractions (FeraSpin™XS, S, M, L, XL, XXL). The magnetic properties of the colloids were characterized by isothermal magnetization, as well as frequency-dependent optomagnetic and AC susceptibility measurements. From these measurements we derive the underlying moment and relaxation frequency distributions, respectively. Analysis of the distributions shows that the clustering of the initially superparamagnetic cores leads to remanent magnetic moments within the large clusters. At frequencies below 105 rad s-1, the relaxation of the clusters is dominated by Brownian (rotation) relaxation. At higher frequencies, where Brownian relaxation is inhibited due to viscous friction, the clusters still show an appreciable magnetic relaxation due to internal moment relaxation within the clusters. As a result of the internal moment relaxation, the colloids with the large clusters (FS-L, XL, XXL) excel in magnetic hyperthermia experiments.

Place, publisher, year, edition, pages
2018. Vol. 29, no 42, article id 425705
Keywords [en]
core-clusters, magnetic hyperthermia, magnetic nanoparticles, multi-core particles, nanoflowers, numerical inversion, Colloids, Iron oxides, Magnetic moments, Magnetic susceptibility, Medical applications, Nanoparticles, Neutron diffraction, Magnetic nano-particles, Multi core, Nanomagnetics
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-35651DOI: 10.1088/1361-6528/aad67dScopus ID: 2-s2.0-85052695672OAI: oai:DiVA.org:ri-35651DiVA, id: diva2:1261691
Note

This project (NanoMag) has received funding from the European Commission Framework Programme 7 under grant agreement no 604448.

Available from: 2018-11-08 Created: 2018-11-08 Last updated: 2019-06-27Bibliographically approved

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