Reversible magnetism switching of iron oxide nanoparticle dispersions by controlled agglomeration

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.

Keywords

Agglomeration, Light scattering, Magnetic nanoparticles, Magnetic properties, Magnetism, Metal nanoparticles, X ray scattering, Agglomeration degrees, Iron oxide nanoparticle, Magnetic particle spectroscopy (MPS), Non-linear correlations, Organic ligands, Reversible switching, Superparamagnetic iron oxide nanoparticles, Temporal resolution, Iron oxides

URI

https://oa.tib.eu/renate/handle/123456789/8463
https://doi.org/10.34657/7501

Citation

Müssig, S., Kuttich, B., Fidler, F., Haddad, D., Wintzheimer, S., Kraus, T., & Mandel, K. (2021). Reversible magnetism switching of iron oxide nanoparticle dispersions by controlled agglomeration. 3(10). https://doi.org//10.1039/d1na00159k

Collections

Chemie

License

CC BY 3.0 Unported

https://creativecommons.org/licenses/by/3.0/

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