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MA: Fachverband Magnetismus
MA 46: Poster II
MA 46.31: Poster
Thursday, March 21, 2024, 15:00–18:00, Poster C
Structural and magnetic characterization of FeOx nanoparticle dispersions upon freezing and melting — •Maximilian Enneking1,2, Asmaa Qdemat1, Martin Dulle3, Rolf J. Haug4, and Oleg Petracic1,5 — 1Jülich Centre for Neutron Science JCNS-2 und Peter Grünberg Institut PGI-4, Forschungszentrum Jülich GmbH — 2Faculty of Mathematics and Physics, Leibniz Universität Hannover — 3Jülich Centre for Neutron Science (JCNS-1), Forschungszentrum Jülich GmbH — 4Institute of Solid State Physics, Leibniz Universität Hannover — 5Heinrich Heine University Düsseldorf, Faculty of Mathematics and Natural Sciences, Düsseldorf
We have studied the structural and magnetic properties of magnetic nanoparticle dispersions upon cooling and heating over the solvent melting temperature. The particles consist of iron oxide dispersed in water or toluene with diameters ranging from 10 to 20 nm. The magnetic properties were studied using SQUID magnetometry employing zero field cooled (ZFC)/field cooled (FC) magnetization curves at different fields and hysteresis curves. To investigate the influence of temperature on the properties of nanoparticles and their assemblies, in situ SAXS measurements were performed at variable temperatures. We observe distinct freezing/melting signatures in magnetometry of the nanoparticle-solvent system depending on the particle size and the type of solvent.
Keywords: magnetic nanoparticles; self-organisation; Colloid