Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 51: Magnetism Poster B
MA 51.11: Poster
Donnerstag, 4. April 2019, 15:00–18:00, Poster C
Studying chain formation in ferrofluids and ferrogels by Mössbauer spectroscopy — •Damian Günzing1, Joachim Landers1, Soma Salamon1, Hajnalka Nádasi2, Alexey Eremin2, and Heiko Wende1 — 1Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen — 2Institute of Physics, University of Magdeburg
In this study we investigated the magnetic field induced chain formation of spherical iron oxide nanoparticles (diameter d ≈ 10 nm) dispersed in n-dodecan as a ferrofluid. The ferrogel was prepared by the mentioned ferrofluid and an additional gelator. The chain length was evaluated by measuring the diffusive mobility and orientation of the particles simultaneously via Mössbauer spectroscopy. The Mössbauer spectra were recorded at temperatures from 234 to 258 K in an applied magnetic field parallel (up to 150 mT) and perpendicular (up to 750 mT) to the incident γ-rays. The results from the Mössbauer spectra were compared to magnetometry data. From the comparison to numerical models we determined a magnetic field driven reversible chain formation with a mean chain length of up to ca. 3 particles. This work is financially supported by the DFG priority program SPP1681 (WE2623-7).