Magnetite (Fe3O4) nanoparticles were synthesized from the Fe2+ ions in the form of ferrous chloride tetrahydrate (FeCl2.4H2O) by coprecipitation method at low temperature (⩽70 °C). During the precipitation process pH was kept constant at 7.37, 8.07, 9.12, 10.37 and 10.55 respectively. It was found that the magnetite nanoparticles was formed as a result of the dehydration reaction of ferrous hydroxide and ferric oxyhydroxide, in which the latter compound was produced by the partial oxidation of ferrous hydroxide by O2 in dissolved air during the synthesis. The X-ray diffraction (XRD) and transmission electron microscopy (TEM) have been used to characterize these resulted particles. The average crystalline size of Fe3O4 was obtained in the range between 18-55 nm for the corresponding range of pH used in the process. These results show that the pH of precipitation and the valence of the metal salt used in the synthesis have played an important role in influencing the particle size.
The 4th Nanoscience and Nanotechnology Symposium (NNS2011): an International Symposium
- Pub Date:
- December 2011
- X-ray diffraction;
- nanostructured materials;
- Sol-gel processing precipitation;
- X-ray diffraction