Nanoparticles released into the environment could act as heterogeneous nucleation sites to incorporate toxic elements and molecules into a �hybrid� engineered/natural nanoparticle composite. To achieve a better understanding of the fate and transport of iron and cerium oxide nanoparticles, we studied two important cases: in situ nucleation and growth of iron oxide nanoparticles in the presence of arsenic, and the stability changes of engineered cerium oxide nanoparticles in the presence of ferrous ions. We utilized a simultaneous small angle X-ray scattering (SAXS)/grazing incidence SAXS setup to monitor in situ nucleation and growth of iron oxides on quartz. To characterize changes in metal oxide nanoparticle phases, we used atomic force microscopy, electron microscopy, Raman spectroscopy, and X-ray absorption spectroscopy. This study provides a quantitative and qualitative depiction of the evolution of important redox reactive metal oxide nanoparticles at dynamic environmental interfaces.

Transformation of redox active iron and cerium oxide nanoparticles at environmental interfaces

248th National Meeting (2014)

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