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. 2023 Mar 14;9(3):217.
doi: 10.3390/gels9030217.

Study of the Possibility of Using Sol-Gel Technology to Obtain Magnetic Nanoparticles Based on Transition Metal Ferrites

Nina Shabelskaya  1   2 , Sergey Sulima  3 , Elena Sulima  3 , Oleg Medennikov  1 , Marina Kulikova  1 , Tatyana Kolesnikova  1 , Svetlana Sushkova  2
Affiliations

Study of the Possibility of Using Sol-Gel Technology to Obtain Magnetic Nanoparticles Based on Transition Metal Ferrites

Nina Shabelskaya et al. Gels. .

Abstract

The article presents results for the magnetic nanoparticles sol-gel method synthesis of cobalt (II) ferrite and organic-inorganic composite materials based on it. The obtained materials were characterized using X-ray phase analysis, scanning and transmission electron microscopy, Scherrer, Brunauer-Emmett-Teller (BET) methods. A composite materials formation mechanism is proposed, which includes a gelation stage where transition element cation chelate complexes react with citric acid and subsequently decompose under heating. The fundamental possibility of obtaining an organo-inorganic composite material based on cobalt (II) ferrite and an organic carrier using the presented method has been proved. Composite materials formation is established to lead to a significant (5-9 times) increase in the sample surface area. Materials with a developed surface are formed: the surface area measured by the BET method is 83-143 m2/g. The resulting composite materials have sufficient magnetic properties to be mobile in a magnetic field. Consequently, wide possibilities for polyfunctional materials synthesis open up for various applications in medicine.

Keywords: cobalt (II) ferrite; composite materials; magnetic composites; magnetic nanoparticles; sol–gel method.

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Conflict of interest statement

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.

Figures

Figure 1
Figure 1
X-ray pattern of synthesized samples: (a)—CoFe2O4, (b)—CoFe2O4/C, (c)—CoFe2O4/S.
Figure 2
Figure 2
Micrographs of synthesized samples: (a)—CoFe2O4, (b)—CoFe2O4/C, (c)—CoFe2O4/S.
Figure 3
Figure 3
Adsorption–desorption isotherms of N2 samples: (a)—CoFe2O4/S, (b)—CoFe2O4/C, (c)—CoFe2O4.
Figure 4
Figure 4
Magnetic hysteresis loops of synthesized samples.
Figure 5
Figure 5
Possible structure of the intermediate citrate complex of transition elements.
Figure 6
Figure 6
TEM image of the sunflower/CoFe2O4 biochar sample (a), particle size distribution (b).
Figure 7
Figure 7
Magnetic separation of synthesized material: composites (a–d), schematic representation (e,f).
See this image and copyright information in PMC

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