Main Article Content
Superparamagnetic iron oxide nanoparticles (SPIONs) have been the material of choice for the biomedical industry as well as scientific community due to their extreme stability, well-known metabolism of iron in the human body, acceptable magnetic properties, easiness, low cost and scalability of production. However, recently alternative iron-based materials with enhanced magnetic properties have been considered for improved performance in biomedical applications.
In this work, we study iron nitride Fe3N nanoparticles, as alternative candidates in biomagnetic applications due to their larger saturation magnetization values(Ms (Fe3N) = 128 Am2/kg vs Ms (Fe3O4) = 61 Am2/kg). Calorimetry results demonstrate significantly enhanced magnetic fluid hyperthermia heating performance compared to iron oxides as shown in Fig. 1.
Crucial question for further development of Fe3N particles is stability in biological environment. The as-synthesized spherical Fe3N nanoparticles (13.5 nm) demonstrate very good stability of magnetic properties in water (Fig 2.). Transmission electron microscopy studies show that the reason for this is formation of a thin oxide layer that protects particles from further oxidation.
I. Dirba et al., J. Phys. D: Appl. Phys. 2022, https://doi.org/10.1088/1361-6463/aca0a9