Iron oxide nanoparticles with uniform size and narrow size distribution were synthesized by electrospraying of ferritin and subsequent heat treatment at 800°, 850°, and 900°C. Solutions of ferritin in both water and water/iso-propanol mixture (50:50) were electrosprayed in diverse gaseous environments. Narrow mobility size distributions with a mean mobility diameter of 4.5 nm and a geometric standard deviation < 1.2 were obtained at 800°C. The process of aerosol formation involved the thermal oxidation of the ferritin organic shell. The utilization of a water/iso-propanol (50:50) ferritin solution led to the establishment of a more stable electrospray, and, consequently, an increase in the total particle concentration was observed. Furthermore, carbon-coated magnetite (Fe 3 O 4) particles were generated when CO was used as carrier gas.
- iron oxide nanoparticles