Electrokinetic properties and stability of cerium dioxide suspensions

S. Bárány, K. Bohacs, I. Chepurna, R. Meszaros

Research output: Contribution to journalArticle

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Abstract

The dispersed ceria particles synthesized by destruction (heating) of the double salts of cerium and ammonium nitrate have been determined to be porous. The surface charge density and electrokinetic potential of the particles have been measured by potentiometric titration and micro-electrophoresis. The point of zero charge (pzc) corresponds to pH 5.6 in water and pH 5.2 in 0.001 M KCl solution, whereas the isoelectric point remains around pH 5.8 for both solutions. Constant (negative) values of the ζ-potential in 0.001-0.01 M KCl solutions have been measured; however, at higher salt concentrations, a gradual decrease of the ceria electrokinetic potential has been observed. Addition of CaCl2 and AlCl3 or LaCl3 obtains a considerable decrease in the ζ-potential of the particles and changes the sign correspondingly. After ultrasonic treatment of the suspension, a monomodal particle size distribution with an average particle size of 0.6 μm was measured. Moreover, the laws of aggregation of CeO2 particles as a function of aging, pH, shear conditions and the concentration of added KCl and CaCl2 solutions have been studied. The obtained results can be explained from the viewpoint that micron-sized strongly hydrated CeO2 particles have a tendency to aggregate over the time under applying shear force or in the presence of electrolytes in a secondary minimum with the formation of loose, easily destroyable and renewable aggregates.

Original languageEnglish
Pages (from-to)69343-69351
Number of pages9
JournalRSC Advances
Volume6
Issue number73
DOIs
Publication statusPublished - 2016

Fingerprint

Cerium
Suspensions
Cerium compounds
Salts
Surface charge
Charge density
Electrophoresis
Titration
Particle size analysis
Electrolytes
Nitrates
Agglomeration
Aging of materials
Ultrasonics
Particle size
Heating
ceric oxide
Water

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Electrokinetic properties and stability of cerium dioxide suspensions. / Bárány, S.; Bohacs, K.; Chepurna, I.; Meszaros, R.

In: RSC Advances, Vol. 6, No. 73, 2016, p. 69343-69351.

Research output: Contribution to journalArticle

Bárány, S, Bohacs, K, Chepurna, I & Meszaros, R 2016, 'Electrokinetic properties and stability of cerium dioxide suspensions', RSC Advances, vol. 6, no. 73, pp. 69343-69351. https://doi.org/10.1039/c6ra12725h
Bárány, S. ; Bohacs, K. ; Chepurna, I. ; Meszaros, R. / Electrokinetic properties and stability of cerium dioxide suspensions. In: RSC Advances. 2016 ; Vol. 6, No. 73. pp. 69343-69351.
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