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MA: Fachverband Magnetismus

MA 38: Magnetic Particles / Clusters & Biomagnetism

MA 38.4: Vortrag

Donnerstag, 20. März 2025, 16:00–16:15, H18

Inductive Heating of ZnFe Nanoparticles — •Esra Uz¹, Yohei Fujita², Marina Spasova¹, Tatiana Smaliarova¹, Ivan Tarasov¹, Michael Farle¹, Yuko Ichiyanagi², and Ulf Wiedwald¹ — ¹Universität Duisburg Essen — ²Yokohama National University

Hyperthermia is a novel medical treatment that uses magnetic fields in combination with specially designed magnetic nanoparticles for the non-invasive elimination of pathological cells. The ZnFe nanoparticles (6-19 nm) have been chemically synthesized and analyzed with a focus on applications in magnetic hyperthermia. The structure and morphology of the nanoparticles have been investigated using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results confirm the cubic spinel structure of the nanoparticles. Vibrating sample magnetometry (VSM) revealed a ferromagnetic character of the 19 nm particles with a saturation magnetization of 79.8 Am*m/kg. The smaller particles, however, have shown superparamagnetic behavior. For two distinct particle sizes, 11 nm and 19 nm, agarose gel electrophoresis was applied to experimentally measure the heating power in an alternating magnetic field (100-250 kHz, 0-50 mT). For the specific loss power (SLP), determined by calorimetry, our experiments show a maximum value of 71 W/g at a frequency of 247 kHz and B = 40 mT. These findings demonstrate that ZnFe nanoparticles are a promising candidate for applications in the context of magnetic hyperthermia.

Keywords: inductive heating; zinc ferrite; nanoparticles; hyperthermia