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2021
Journal Article
Title
Reversible magnetism switching of iron oxide nanoparticle dispersions by controlled agglomeration
Abstract
The controlled agglomeration of superparamagnetic iron oxide nanoparticles (SPIONs) was used to rapidly switch their magnetic properties. Small-angle X-ray scattering (SAXS) and dynamic light scattering showed that tailored iron oxide nanoparticles with phase-changing organic ligand shells agglomerate at temperatures between 5 °C and 20 °C. We observed the concurrent change in magnetic properties using magnetic particle spectroscopy (MPS) with a temporal resolution on the order of seconds and found reversible switching of magnetic properties of SPIONs by changing their agglomeration state. The non-linear correlation between magnetization amplitude from MPS and agglomeration degree from SAXS data indicated that the agglomerates' size distribution affected magnetic properties.
Author(s)
Müssig, Stephan
Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nuernberg (FAU), Erlangen, Germany
Wintzheimer, Susanne
Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nuernberg (FAU), Erlangen, Germany
Kraus, Tobias
INM-Leibniz-Institute for New Materials, Campus D2 2, Saarbrücken, Germany; Colloid and Interface Chemistry, Saarland University, Saarbrücken, Germany