Dresden 2026 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 7: Poster Magnetism I
MA 7.25: Poster
Montag, 9. März 2026, 09:30–12:30, P2
Magnetic relaxation and structural characterization of single-core FeOx nanoparticle dispersions in solvents of varying viscosity — •Amala Thuruthiyil Jose1,2, Sascha Ehlert3, Artem Feoktystov4, Andreas Stadler3,2, Martin Dulle3, and Oleg Petracic1,5 — 1Jülich Centre for Neutron Science JCNS-2, Forschungszentrum Jülich GmbH, Germany — 2RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany — 3Jülich Centre for Neutron Science JCNS-1, Forschungszentrum Jülich GmbH, Germany — 4Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS) at MLZ, Lichtenbergstrasse 1, Garching, Germany — 5Heinrich Heine University Düsseldorf, Faculty of Mathematics and Natural Sciences, Düsseldorf
We have investigated the structural and magnetic properties of monodisperse single-core iron-oxide nanoparticles dispersed in solvents of systematically varied viscosity. The particles were synthesized via thermal decomposition. Magnetic measurements were performed using SQUID magnetometry, employing zero-field-cooled (ZFC) and field-cooled (FC) curves to probe changes in blocking behavior and relaxation dynamics. To examine the influence of the solvent environment on particle stability, SAXS measurements were carried out. We observe clear viscosity-dependent shifts in the nanoparticle solvent system, reflecting the gradual emergence of Brownian relaxation as solvent mobility increases. The observed viscosity and phase-dependent magnetic signatures demonstrate how solvent dynamics can be used to tune and separate Néel and Brownian relaxation.
Keywords: magnetic nanoparticles; Néel–Brownian relaxation; solvent viscosity