COMPARATIVE CHARACTERIZATION OF AQUEOUS SUSPENSIONS OF MAGNETIC IRON OXIDE NANOPARTICLES WITH DIFFERENT PHASE COMPOSITIONS

A. S. KOVALENKO; Коваленко А. С.; O. A. O. A. SHILOVA; Шилова О. А.; A. M. NIKOLAEV; Николаев А. М.; S. V.  MYAKIN; Мякин С. В.

doi:10.31857/S0023291223600116

COMPARATIVE CHARACTERIZATION OF AQUEOUS SUSPENSIONS OF MAGNETIC IRON OXIDE NANOPARTICLES WITH DIFFERENT PHASE COMPOSITIONS

Authors: KOVALENKO A.S.¹, O. A. SHILOVA O.A.²^,3, NIKOLAEV A.M.¹, MYAKIN S.V.³^,4
Affiliations:
1. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg, Russia.
2. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg, Russia
3. St. Petersburg State Technological Institute (Technical University), St. Petersburg, Russia
4. Institute of Analytical Instrument Making, Russian Academy of Sciences, St. Petersburg, Russia
Issue: Vol 85, No 3 (2023)
Pages: 319-327
Section: Articles
URL: https://journals.rcsi.science/0023-2912/article/view/137227
DOI: https://doi.org/10.31857/S0023291223600116
EDN: https://elibrary.ru/ZORDCA
ID: 137227

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Abstract
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Abstract

The interaction of iron oxide nanoparticles with an aqueous medium has been studied. The composition of the nanoparticles corresponds to magnetite–maghemite solid solutions with different Fe2+/Fe3+ ratios. Nanoparticles that most closely correspond to the composition of maghemite (γ-Fe2O3) have largest hydrodynamic diameters and cause a drastic decrease in the pH of the dispersion medium during the dispersion of the powders in water. Nanoparticles that have a phase composition of a solid solution corresponding to the middle of the magnetite–maghemite series are characterized by a gradual and less pronounced decrease in pH. It has been shown that dilution of aqueous suspensions obtained from preliminarily dried powders within a concentration range of 100–0.001 mg/L followed by sonication leads to a significant increase in the hydrodynamic diameter of iron oxide particles. A possible mechanism of the studied interaction of nanoparticles with the aqueous medium has been considered. This mechanism comprises the hydration of Lewis acid sites formed by iron ions and changes in the character of the dissociation of hydroxyl groups depending on the pH of a suspension. The effect of surface passivation of the studied nanopowders with oleic acid on the processes under consideration has been investigated. The results obtained make it possible to predict the aggregative stability and a number of other characteristics of the studied suspensions being diluted with water.

References

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