Journal
ENVIRONMENTAL SCIENCE-NANO
Volume 1, Issue 5, Pages 429-444Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4en00105b
Keywords
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Funding
- Sustainable Nanotechnology Organization
- Tracy Farmer Institute for Sustainability and the Environment
- Department of Pharmaceutical Sciences, University of Kentucky
- Office of the Vice President for Research, University of Kentucky
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Nanoceria redox properties are affected by particle size, particle shape, surface chemistry, and other factors, such as additives that coat the surface, local pH, and ligands that can participate in redox reactions. Each CeO2 crystal facet has a different chemistry, surface energy, and surface reactivity. Unlike nanoceria's industrial catalytic applications, biological and environment exposures are characterized by high water activity values and relatively high oxygen activity values. Electrochemical data show that oxygen levels, pH, and redox species affect its phase equilibria for solution and dissolution. However, not much is known about how the many and varied redox ligands in environmental and biological systems might affect nanoceria's redox behaviour, the effects of coated surfaces on redox rates and mechanisms, and whether the ceria solid phase undergoes dissolution at physiologically relevant pH and oxygen levels. Research that could answer these questions would improve our understanding of the links between nanoceria's redox performance and its morphology and environmental conditions in the local milieu.
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