Superparamagnetic-like Micrometric Single Crystalline Magnetite for Biomedical Application Synthesis and Characterization

Single-crystalline magnetite (Fe3O4) particles having a size beyond the nanometric range (1 µm to 50 µm) and showing high (close bulk value) saturation-specific magnetization (σs = 92 emu/g), were obtained by hydrothermal decomposition of Fe-EDTA complex. The very low values magnetic remanence (σr 0.82 emu/g) coercitivity (μoHc 1.53 mT) observed at room temperature (RT) suggest superparamagnetic-like behavior, which is quite remarkable for such micrometric particles. As confirmed vibrating sample magnetometer (VSM)-based measurements, minor changes in their properties occur between RT 5K. Scanning electron microscopy (SEM) has revealed morphology consisting combination non-porous octahedral- dodecahedral-shaped particles, energy dispersive X-ray analysis (EDX) indicated elemental (Fe O) purity, whereas diffraction (XRD) single crystal structure. nitrogen adsorbtion–desorption isotherm pore distribution are presented sample. Thermomagnetic records under zero field-cooled (ZFC) (FC) conditions have thermal hysteresis Verwey transition.The point (TV) major step phase transformation takes place located around 132 K heating 122 cooling. These microcrystals do not remain agglomerated when polarizing field removed, an essential requirement biomedical applications met.