Title

Nanoceria: Factors Affecting Its Pro- And Anti-Oxidant Properties

Abstract

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.

Publication Date

10-1-2014

Publication Title

Environmental Science: Nano

Volume

1

Issue

5

Number of Pages

429-444

Document Type

Review

Personal Identifier

scopus

DOI Link

https://doi.org/10.1039/c4en00105b

Socpus ID

84922509169 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84922509169

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