Temperature Effect on the Aggregation Kinetics of CeO2 Nanoparticles in Monovalent and Divalent Electrolytes
Received Date: Jul 15, 2012 / Accepted Date: Oct 26, 2012 / Published Date: Oct 29, 2012
Aggregation of engineered nanoparticles (NPs) plays a crucial role in their environmental transport, fate,bioavailability and biological effects. This study investigated the temperature effect on the aggregation kinetics of CeO2 NPs in KCl and CaCl2 solutions using time-resolved dynamic light scattering. The results show that in KCl and CaCl2, the aggregation rate became faster as the temperature increased. The critical coagulation concentration (CCC) of CeO2 NPs went down from approximately 100 to 10 mM in KCl and from approximately 10 to 2 mM in CaCl2 solutions when the temperature increased from 4 to 37°C. The observations were analyzed in the framework of extended Derjaguin-Landau-Verwey-Overbeek (EDLVO) theory in order to find out the mechanisms underlying the temperature effect. Moreover, a theoretical model developed on the basis of EDLVO theory and von Smoluchowski’s population balance equation was used to predict the aggregation kinetics of CeO2 NPs under different temperature. The model predictions agreed well with experimental data, suggesting that the model could be employed to predict the size change of NPs in solution. Overall, this work provides insights into NP aggregation using experimental and modeling approaches, and allows people to better understand and theoretically predict the environmental behavior and risk of NPs.
Keywords: Nanoparticle; Aggregation; Temperature; EDLVO
Citation: Chen Y, Huang Y, Li K (2012) Temperature Effect on the AggregationKinetics of CeO2 Nanoparticles in Monovalent and Divalent Electrolytes. J EnvironAnal Toxicol 2:158. Doi: 10.4172/2161-0525.1000158
Copyright: © 2012 Chen Y, et al. This is an open-access article distributed underthe terms of the Creative Commons Attribution License, which permits unrestricteduse, distribution, and reproduction in any medium, provided the original author andsource are credited.
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