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MA: Fachverband Magnetismus
MA 38: Magnetic Particles / Clusters & Biomagnetism
MA 38.8: Vortrag
Donnerstag, 20. März 2025, 17:15–17:30, H18
Iron Nitride Magnetic Nanoparticles for Biomedical Applications — •Sayar Das1, Yevhen Ablets1, Lenka Kubíčková2, Imants Dirba1, and Oliver Gutfleisch1 — 1TU Darmstadt, Germany — 2FZU, Praha, Czech Republic
With the urgent need for advanced materials in healthcare, magnetic nanoparticles (MNPs) have emerged to be helpful in versatile biomedical applications such as Hyperthermia for cancer treatment, contrast agents for Magnetic resonance Imaging, drug delivery, and others. For such applications, MNPs must be small in size and have high saturation magnetization (Ms) for better performance. Typically, iron oxide nanoparticles are used as they are inexpensive, chemically stable, and show low toxicity. Owing to the superior properties of iron nitride phases, it is considered a promising candidate over traditionally used iron oxides. This study systematically investigates the synthesis and characterization of iron nitride nanoparticles for intended biomedical applications. MNPs are synthesized via the thermal decomposition method using Fe(CO)5 as a precursor, where nitriding is realized with ammonia as a carrier gas. Key findings demonstrate that surfactant-free synthesis yields ε-Fe3N nanoparticles with Ms up to 122 Am2/kg and a mean particle size of 14 nm. Synthesis with surfactants results in nanoparticles with higher yields and enhanced Ms. Moreover, using pure hydrogen as a reducing agent during synthesis significantly improves magnetic properties, with room temperature Ms reaching 162 Am2/kg at a particle size of 15 nm, which is the highest Ms in iron nitride nanoparticles prepared by wet chemical routes up to date.
Keywords: Magnetic nanoparticles; Biomedical; Iron nitrides; Hyperthermia; Thermal Decomposition