Engineered nanomaterials (ENMs) have been increasingly used over the past few years for a variety of medical and commercial applications. With their increased use, it has become more pressing to study them in detail to understand their environmental and biological effects. ENMs can undergo many transformations, including aggregation and surface adsorption of small molecules and proteins. Silver nanoparticles (AgNPs) serve as a good model ENM for the development of new analytical tools capable of studying these transformations.We are developing a voltammetric technique to monitor aggregation of AgNPs. The technique combines particle-impact voltammetry and UV-Vis detection. Particle-impact voltammetry is an emerging electrochemical technique that involves the impact of an ENM at an ultramicroelectrode, resulting in a measurable change in the current. Coupling this technique with kinetic UV-Vis studies allows us to correlate changes in particle-impact current transients to the formation of AgNP aggregates. Offline studies of particle-impact voltammetry and UV-Vis will be presented, along with preliminary data from the combined detection scheme.

Monitoring the aggregation of silver nanoparticles using particle-impact voltammetry coupled with UV-vis spectroscopy

256th National Meeting (2018)

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