Natural Organic Matter Concentration and Hydrochemistry Influence Aggregation Kinetics of Functionalized Engineered Nanoparticles
- 17 April 2013
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 47 (9), 4113-4120
- https://doi.org/10.1021/es302447g
Abstract
Understanding the colloidal stability of functionalized engineered nanoparticles (FENPs) in aquatic environments is of paramount importance in order to assess the risk related to FENPs. In this study, gold nanoparticles (GNPs) of 68 and 43 nm diameter, coated with citrate and 11-mercaptoundecanoic acid (MUA) respectively, were used as models of FENPs. Time resolved dynamic light scattering was employed to investigate the aggregation kinetics of two types of GNPs. The results show that without Suwannee river natural organic matter (SRNOM), MUA coating resulted in greater stability than citrate coating for GNPs. Cations have a destabilizing effect on both GNPs following the order Ca2+ approximate to Mg2+ >> Na+; different anions (Cl- and SO42-) showed no difference in effects. In the fast aggregation regime, adding SRNOM enhanced the stability of MUA-coated GNPs in both Ca2+ and Mg2+ solutions. However citrate coated GNPs were only stabilized in Mg2+ solution but enhanced aggregation occurred in high Ca2+ concentration due to interparticle bridging. For the investigated GNPs and in the presence of SRNOM, Ca2+ does not always act as a strong coagulant This indicates that for the new materials emerging from the application of nanotechnology the well described aggregation mechanisms of colloids in the environment require a detailed re-examination.Keywords
This publication has 46 references indexed in Scilit:
- Analysis of engineered nanomaterials in complex matrices (environment and biota): General considerations and conceptual case studiesEnvironmental Toxicology and Chemistry, 2011
- Aggregation Kinetics of Citrate and Polyvinylpyrrolidone Coated Silver Nanoparticles in Monovalent and Divalent Electrolyte SolutionsEnvironmental Science & Technology, 2011
- The release of engineered nanomaterials to the environmentJournal of Environmental Monitoring, 2011
- Interactions between Natural Organic Matter and Gold Nanoparticles Stabilized with Different Organic Capping AgentsEnvironmental Science & Technology, 2010
- UV Irradiation and Humic Acid Mediate Aggregation of Aqueous Fullerene (nC60) NanoparticlesEnvironmental Science & Technology, 2010
- Aggregation kinetics of cerium oxide nanoparticles in monovalent and divalent electrolytesColloids and Surfaces A: Physicochemical and Engineering Aspects, 2010
- Assessment of the In Vivo Toxicity of Gold NanoparticlesNanoscale Research Letters, 2009
- Estimating the relevance of engineered carbonaceous nanoparticle facilitated transport of hydrophobic organic contaminants in porous mediaEnvironmental Pollution, 2009
- Physicochemical Properties and Cellular Toxicity of Nanocrystal Quantum Dots Depend on Their Surface ModificationNano Letters, 2004
- Atomic Force Microscopy Evidence of Citrate Displacement by 4-Mercaptopyridine on Gold in Aqueous SolutionLangmuir, 2000