Heteroaggregation of gold nanoparticles with model colloids and the influence of environmental aqueous chemistry Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/pn89db06v

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  • Nanoparticles are becoming increasingly important in numerous technological fields but evidence shows that they can be toxic to many organisms. To predict their fate and transport in the environment, nanoparticle attachment to naturally occurring colloids must be examined. This study investigated citrate-capped gold nanoparticle (Cit-AuNP) heteroaggregation with two model colloids in the presence of natural organic matter (NOM) in different aqueous chemistries. Experimental findings show that the colloidal surface charge relative to Cit-AuNPs strongly influenced attachment in 1mM KCl. Up to 1mg/L NOM stabilized Cit-AuNPs and drastically reduced heteroaggregation, regardless of system pH. In more complex conditions containing divalent cations, NOM also prevented significant heteroaggregation but Cit-AuNP homoaggregation was minimally impacted. This demonstrates that in natural aqueous systems, the presence of NOM stabilizes Cit-AuNPs which enhances transport away from the source of contamination and discourages settling into sediment material.
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