Understanding the aggregation behavior of engineered nanomaterials (ENMs) in aqueous environments is essential to understanding their fate, transport, and toxicity. This study is investigating the role of natural and engineered capping agents on the heteroaggregation of gold nanoparticles (AuNPs) with naturally occurring colloids. Initial experiments are being performed with AuNPs stabilized with various organic capping agents and using hematite as a model colloid. AuNP-hematite interactions are being investigated under a matrix of conditions defining relevant particle concentrations and ratios, ionic strength, and pH in the presence and absence of natural organic matter. Heteroaggregation is being quantified using parallel techniques: time-resolved dynamic light scattering and fractionation (e.g., filtration or ultracentrifugation) followed by total mass measurements using inductively coupled plasma spectrometry and/or instrumental neutron activation analysis. The results of this research will help inform future work toward the development of predictive relationships for ENM behavior based on ENM characteristics and environmental conditions.

Heteroaggregation of capped gold nanoparticles and natural colloids under relevant environmental conditions

245th National Meeting (2013)

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