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MM: Fachverband Metall- und Materialphysik
MM 32: Nanomaterials: Surface Effects
MM 32.4: Vortrag
Donnerstag, 8. September 2022, 12:30–12:45, H45
Synthesis of superparamagnetic iron oxide nanoparticles by electron beam irradiation — •Johannes Dietrich1,2 and Stefan Mayr1,2 — 1Leibniz-Institut für Oberflächenmodifizierung e.V. (IOM), Permoserstraße 15, 04318 Leipzig — 2Universität Leipzig, Fakultät für Physik und Geowissenschaften, Abteilung Oberflächenphysik, Linnéstraße 5, 04103 Leipzig
Nanoparticles based on iron oxides are a highly versatile material used in a broad range of applications, for instance embedding magnetic particles in polymer matrices to create ferrogels. A common procedure is to synthesize the particles in separate processes, add them to the gel and crosslink the polymer chains with nanoparticles by electron beam treatment. Combining synthesis and crosslinking would offer the possibility to create ferrogels by an one-step process.
In our work, we show a procedure to synthesize superparamagnetic nanoparticles with a narrow size distribution and an average size of approximately 5 nm directly by electron beam irradiation. The formation of small amounts of nanoparticles could already observed for doses of 50 kGy, but these particles showed a low crystallinity and a higher percentage of amorphous particles. For higher doses increasing crystallinity and yield could be observed, which is also reflected in the higher saturation magnetization for samples irradiated with higher doses. Additionally, particles irradiated with doses starting from 150 kGy show a tendency to form bigger cluster with sizes from 34 nm to 73 nm.