Aggregation kinetics of CeO 2 nanoparticles in KCl and CaCl 2 solutions: Measurements and modeling

Kungang Li, Wen Zhang, Ying Huang, Yongsheng Chen

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

To characterize the environmental transport and health risks of CeO 2 nanoparticles (NPs), it is important to understand their aggregation behavior. This study investigates the aggregation kinetics of CeO 2 NPs in KCl and CaCl 2 solutions using timeresolved dynamic light scattering (TR-DLS). The initial hydrodynamic radius of CeO 2 NPs measured by DLS was approximately 95 nm. Attachment efficiencies were derived both from aggregation data and predictions based on the Derjaguin-Landau-Verwey- Overbeek (DLVO) theory. The deviations of the DLVO predictions were corrected by employing the extended DLVO (EDLVO) theory. The critical coagulation concentration (CCC) of CeO 2 NPs at pH = 5.6 is approximately 34 mM for KCl and 9.5 mM for CaCl 2. Furthermore, based on the EDLVO theory and the von Smoluchowski's population balance equation, a model accounting for diffusion-limited aggregation (DLA) kinetics was established. For the reactionlimited aggregation (RLA) kinetics, a model that takes fractal geometry into account was established. The models fitted the experimental data well and proved to be useful for predicting the aggregation kinetics of CeO 2 NPs.

Original languageEnglish (US)
Pages (from-to)6483-6491
Number of pages9
JournalJournal of Nanoparticle Research
Volume13
Issue number12
DOIs
StatePublished - Dec 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • Aggregation
  • CeO
  • DLVO
  • EDLVO
  • Kinetics
  • Modeling and simulation
  • Nanoparticle

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