Investigation into the solubility of nanopowders of the ZrO2–Y2O3–CeO2–Al2O3 system in the aqueous medium at various pH
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Nanopowders of ZrO2–Y2O3–CeO2 and ZrO2–Y2O3–CeO2–Al2O3 systems are investigated with the purpose of studying the influence of pH of the dispersed medium on the solubility of nanopowder particles of a complex composition in an aqueous medium after membrane filtration and centrifugation to further prepare the stable dispersions necessary for toxicological investigations of nanoparticles. Concentrations of elements remaining in a supernatant after the sample preparation, which includes membrane filtration and centrifugation, are measured by inductively coupled plasma optical emission spectroscopy. It is established that that the largest aggregative stability of the nanopowder dispersion without the Al2O3 additive corresponds to the optimal range of pH 5.5–9.5, while with the Al2O3 additive, it is region pH 7.0. The results evidence that, when dispersing these powders, the hydrosol of yttrium oxyhydroxide, which is dissolved at pH < 6.0, is formed. When dissolving in water of the powder with the Al2O3 additive in the neutral medium, aluminum hydroxide is formed; in the acidic medium (pH < 6), it is replaced by main soluble aluminum salts; and in the alkali medium (pH > 7), amphoteric aluminum hydroxide is dissolved because of the formation of aluminates.
Keywordsnanoparticles size agglomeration degree ZrO2–Y2O3–CeO2–Al2O3 system bioinert ceramics dissolution aqueous dispersions yttrium oxyhydroxide hydrosol aggregative stability inductively coupled plasma optical emission spectroscopy toxicity nanotoxicology differential centrifugal sedimentation practical recommendations
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