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Currently, when nanomaterials have opened a new era in materials science, the study of the influence of synthesis conditions on the phase composition requires more attention. Ferrite nanoparticles have demonstrated immense popularity in the field of biomedicine due to their widespread use for cell separation, contrast agents, means for magnetically induced hyperthermia, in particular in the treatment of tumors. Chemical methods are considered as basic in the technology of nanomaterials production. In this work, nano-dispersed cobalt ferrite was synthesized by a two-stage method of coprecipitation and subsequent treatment with contact low-temperature nonequilibrium plasma (CNP). Since solutions treated with plasma, containing radicals, peroxides, have oxidizing properties, such chemically "activated" solutions can be used to produce cobalt ferrites. Formed oxidizing agents, initiate the formation of oxides of iron and cobalt. Thus, it has been established that, under the influence of contact plasma, hydrogen peroxide in solutions rapidly reacts with the formation of cobalt ferrite. The influence of the processing of KNP on the structural and magnetic properties of cobalt ferrite has been investigated. X-ray diffraction analysis, infrared Fourier transform spectroscopy (IR), and vibrational magnetometry (at room temperature) were used to determine the structural and magnetic properties. Infrared spectroscopy in the range from 400 to 4000 cm confirmed the internal cationic vibrations of the spinel structure. The IR spectra showed the presence of absorption at 3414, 1617, 592 and 420 cm. The last two bands can be attributed to cation oscillations in tetrahedral and octahedral positions in CoFe2O4 spinel. X-ray phase analysis showed the formation of cobalt ferrite as a single phase. X-ray diffraction analysis and TEM showed that the resulting cobalt ferrite was obtained in the nano range. The average particle size, measured using TEM microscopy, was 30-50 nm. The saturation magnetization 58-61 Am / g corresponds to the estimate of other authors. The coercivity is about 450 Oe, which is higher than for dispersed materials obtained by other methods.

vìsnik nacìonalʹnogo tehnìčnogo unìversitetu "hpì". novì rìšennâ v sučasnih tehnologìâh/vestnik nacionalʹnogo tehničeskogo universiteta "hpi". novye rešeniâ v sovremennyh tehnologiâh

Plasmоchemical synthesis and magnetic properties of nanodispersy ferrites of cobalt