Abstract
Fe3O4 and ZnxFe3−xO4 pure and doped magnetite magnetic nanoparticles (NPs) were prepared in aqueous solution (Series A) or in a water-ethyl alcohol mixture (Series B) by the co-precipitation method. Only one ferromagnetic resonance line was observed in all cases under consideration indicating that the materials are magnetically uniform. The shortfall in the resonance fields from 3.27 kOe (for the frequency of 9.5 GHz) expected for spheres can be understood taking into account the dipolar forces, magnetoelasticity, or magnetocrystalline anisotropy. All samples show non-zero low field absorption. For Series A samples the grain size decreases with an increase of the Zn content. In this case zero field absorption does not correlate with the changes of the grain size. For Series B samples the grain size and zero field absorption behavior correlate with each other. The highest zero-field absorption corresponded to 0.2 zinc concentration in both A and B series. High zero-field absorption of Fe3O4 ferrite magnetic NPs can be interesting for biomedical applications.
Highlights
In recent years the study and development of nanosized magnetic nanoparticles (NPs) has received growing attention both for understanding their fundamental properties and for their technological, environmental, and biomedical applications [1,2,3,4,5]
For A type samples the grain size decreases with an increase of the Zn content
As the average size of the grains is higher in B-IV case comparing with A-IV, the I(0)/I(Hres) parameter is higher for B-IV case. In both A and B series the highest zero-field absorption corresponded to 0.2 zinc concentration
Summary
In recent years the study and development of nanosized magnetic nanoparticles (NPs) has received growing attention both for understanding their fundamental properties and for their technological, environmental, and biomedical applications [1,2,3,4,5]. Nanoparticles functionalized by chemotherapy drugs play the role of carriers for delivering the drugs to tumor cells with minimum damage to healthy cells They can be employed in hyperthermia and thermal ablation—promising forms of cancer therapy [22]. This means that nanoparticles of 10 to 300 nm in diameter can be appropriate for cancer therapy This approach renewed interest in biocompatible MNPs with bigger size and their methods of fabrication. They were prepared by a co-precipitation method under different conditions Their structural, magnetic and microwave properties were studied as a function of Zn concentration
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