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Investigation into the solubility of nanopowders of the ZrO2–Y2O3–CeO2–Al2O3 system in the aqueous medium at various pH

Makarova, E. N. ; Antsiferova, I. V.

Russian journal of non-ferrous metals, 2017-09, Vol.58 (5), p.525-529 [Periódico revisado por pares]

Moscow: Pleiades Publishing

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  • Título:
    Investigation into the solubility of nanopowders of the ZrO2–Y2O3–CeO2–Al2O3 system in the aqueous medium at various pH
  • Autor: Makarova, E. N. ; Antsiferova, I. V.
  • Assuntos: Chemistry and Materials Science ; Materials Science ; Metallic Materials ; Production Processes and Properties of Powders
  • É parte de: Russian journal of non-ferrous metals, 2017-09, Vol.58 (5), p.525-529
  • Descrição: Nanopowders of ZrO 2 –Y 2 O 3 –CeO 2 and ZrO 2 –Y 2 O 3 –CeO 2 –Al 2 O 3 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 Al 2 O 3 additive corresponds to the optimal range of pH 5.5–9.5, while with the Al 2 O 3 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 Al 2 O 3 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.
  • Editor: Moscow: Pleiades Publishing
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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