Abstract
Colloidal Fe3O4 nanoparticles were synthesized using a gamma-radiolysis method in an aqueous solution containing iron chloride in presence of polyvinyl alcohol and isopropanol as colloidal stabilizer and hydroxyl radical scavenger, respectively. Gamma irradiation was carried out in a 60Co gamma source chamber at different absorbed doses. Increasing the radiation dose above a certain critical dose (100 kGy) leads to particle agglomeration enhancement, and this can influence the structure and crystallinity, and consequently the magnetic properties of the resultant particles. The optimal condition for formation of Fe3O4 nanoparticles with a uniform and narrow size distribution occurred at a dose of 100 kGy, as confirmed by X-ray diffractometry and transmission electron microscopy. A vibrating sample magnetometry study showed that, when radiation dose increased, the saturation and remanence magnetization decreased, whereas the coercivity and the remanence ratio increased. This magnetic behavior results from variations in crystallinity, surface effects, and particle size effects, which are all dependent on the radiation dose. In addition, Fourier transform infrared spectroscopy was performed to investigate the nature of the bonds formed between the polymer chains and the metal surface at different radiation doses.
Highlights
Magnetic nanoparticles have attracted considerable interest in recent years by virtue of their unique physical and chemical properties, which can differ significantly from the bulk or molecular properties of the respective materials [1]
This paper reports the synthesis of colloidal Fe3O4 nanoparticles using a radiolytic reduction method in an aqueous solution
The transmission electron microscopy (TEM) images indicate that the synthesized magnetite nanoparticles are almost spherical in shape and that the particle size increases with absorbed dose
Summary
Magnetic nanoparticles have attracted considerable interest in recent years by virtue of their unique physical and chemical properties, which can differ significantly from the bulk or molecular properties of the respective materials [1]. Magnetic nanoparticles for biomedical uses should possess certain physical features such as small size and a narrow size distribution in order to provide uniform physical and chemical properties in addition to superparamagnetic behavior. These properties make them an ideal candidate for applications such as targeted drug delivery [7,8,9], hyperthermic treatments [10,11,12], magnetic resonance imaging enhancement, and sensing devices [13,14]. Radiolytic reduction is another promising technique [23,24]
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