Two-step single-reactor synthesis of oleic acid- or undecylenic acid-stabilized magnetic nanoparticles by thermal decomposition method

Submitting author affiliation:
Institute of Macromolecular Chemistry CAS, Prague, Czech Republic

Beilstein Arch. 2022, 202212.

Published 02 Mar 2022

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Different iron oxides (i.e., magnetite, maghemite, goethite, wüstite) show distinct effects on biological objects, and thus the investigations of the morphology and phase-structural state have prime priority for their biomedical applications.

The aim of this work was to develop one-pot synthesis of magnetic nanoparticles by thermolysis of Fe(III)-oleate or Fe(III)-undecylate in a high-boiling point solvent in situ, using Fe(III)-acetylacetonate. Magnetic nanoparticles were characterized by transmission electron microscopy, dynamic light scattering, thermogravimetric analysis, АТR-FTIR and 57Fe Mössbauer spectroscopy, X-ray diffraction in terms of morphology, hydrodynamic diameter and composition, respectively. The effect of the solvent and unsaturated higher carboxylic acid, used as a reagent and nanoparticles stabilizer, on the particles’ properties was investigated. Synthesis using undecylenic acid led to the formation of iron oxide particles with larger diameter (11-16 nm according to TEM) which were in 75% formed of magnetite. According to the Mössbauer and XRD results, the organic shell thickness around the nanoparticles depended on the nature of the stabilizer, but it did not prevent the partial oxidation of the particles magnetite core to maghemite. In contrast, monodisperse single-domain maghemite nanoparticles with size less than 8 nm were synthesized using oleic acid in 1-octadecene.

Keywords: Iron oxide nanoparticles, Fe(III)-acetylacetonate, thermal decomposition synthesis, maghemite, magnetite

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Nahorniak, M.; Pasetto, P.; Greneche, J.-M.; Samaryk, V.; Auguste, S.; Rousseau, A.; Nosova, N.; Varvarenko, S. Beilstein Arch. 2022, 202212. doi:10.3762/bxiv.2022.12.v1

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