The unique properties of engineered nanomaterials (ENMs) have enabled their increased use for a range of environmental, medicinal, and commercial applications. However, ENMs can undergo many transformations in environmental and biological matrices (e.g. dissolution, aggregation, adsorption of small molecules, etc.), which alter their physicochemical properties. In order to fully characterize ENM properties in relevant matrices, in situ analytical tools are needed. We have developed a highly reproducible linear sweep stripping voltammetry (LSSV) method to quantify silver nanoparticle (AgNP) dissolution kinetics in real-time. Separately, we have developed a technique that integrates UV-vis spectroscopy with particle-impact voltammetry (PIV/UV-vis) to monitor changes in the bulk AgNP suspension and at the single particle scale, respectively. In the present work, we have coupled our LSSV and PIV/UV-vis techniques to speciate dissolved Ag(I)(aq) and in-tact AgNPs released from AgNP-impregnated textiles in real-time. Specifically, since AgNPs are frequently incorporated in sports-performance clothing, we have evaluated silver release from cotton fabrics exposed to simulated sweat solutions in order to mimic a release and human exposure scenario. We have evaluated the effect of various solution conditions (e.g., temperature, ionic strength, pH, the presence of biomolecules) on Ag(I)(aq) and AgNP release. The development of this novel analytical tool and the insights gained regarding Ag(I)(aq) and AgNP release will be presented.

Development of a novel analytical method for the in situ quantification and speciation of Ag(I) and AgNPs released from nano-enabled textiles

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.