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Reversible magnetism switching of iron oxide nanoparticle dispersions by controlled agglomeration

: Müssig, Stephan; Kuttich, Björn; Fidler, Florian; Haddad, Daniel; Wintzheimer, Susanne; Kraus, Tobias; Mandel, Karl

Volltext ()

Nanoscale advances 3 (2021), Nr.10, S.2822-2829
ISSN: 2516-0230
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ISC ()
agglomeration; light scattering; magnetic nanoparticles; magnetism; metal nanoparticle; X ray scattering

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.