Nano Archive

Aggregation kinetics of CeO2 nanoparticles in KCl and CaCl2 solutions: measurements and modeling

Li, Kungang and Zhang, Wen and Huang, Ying and Chen, Yongsheng (2011) Aggregation kinetics of CeO2 nanoparticles in KCl and CaCl2 solutions: measurements and modeling. Journal of Nanoparticle Research, 13 (12). pp. 6483-6491.

Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.

Abstract

To characterize the environmental transport and health risks of CeO2 nanoparticles (NPs), it is important to understand their aggregation behavior. This study investigates the aggregation kinetics of CeO2 NPs in KCl and CaCl2 solutions using time-resolved dynamic light scattering (TR-DLS). The initial hydrodynamic radius of CeO2 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 CeO2 NPs at pH = 5.6 is approximately 34 mM for KCl and 9.5 mM for CaCl2. 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 reaction-limited 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 CeO2 NPs.

Item Type:Article
ID Code:11482
Deposited By:Prof. Alexey Ivanov
Deposited On:05 Jan 2012 09:30
Last Modified:05 Jan 2012 09:42

Repository Staff Only: item control page