چكيده فارسي :
Magnetic spinel ferrites have generated diverse scientific and technological interests, due to their role in developing our understanding of the fundamentals of nanomagnetism and their promising applications in the fields of high-density data storage, ferrofluid technology, heterogeneous catalysis, magnetic resonance imaging, and drug delivery.
Cobalt ferrite magnetic nanoparticles with mean sizes of 40-80 nm were synthesized. Among the various liquid-phase chemical techniques, reported in the literature and employed for the synthesis of cobalt ferrite nanoparticles, the sol–gel process is the most effective and feasible route to develop high purity, homogeneous and crystalline cobalt ferrite nanoparticles [1]. The corresponding oxide obtained was investigated by various methods such as XRD, IR, SEM and magnetic investigation. The strong and sharp reflection peaks in the XRD pattern indicated that products were well-crystallized [2]. Figure 1 shows the hysteresis loops for cobalt ferrite nanoparticles. It can be seen that the saturation magnetization (Ms) is about 72 emu/g at calcination temperature 1000 ºC, which is smaller than the bulk value (~80 emu/g). The as-prepared sample displayed homogeneous nanospheres, with the average sizes between 20-30 nm, as can be seen in the scanning electron micrographs
