Iron(III) (hydr)oxide nanoparticles are ubiquitous in the environment, where they exist in many forms and play important geochemical roles. Their physical and chemical properties have already found application in many areas including environmental remediation, water treatment, lubrication, heat transfer, (photo)catalysis, sensors, and energy storage/conversion. Biochemical and biological properties of iron(III) (hydr)oxides significantly contribute to microbially-mediated cycling and transport of elements in the environment, as well as to iron homeostasis in all living organisms. Hence, it is important to have a general framework capable of predicting nanosize effects on chemical and biochemical properties of iron(III) (hydr)oxides. In my talk, I will summarize our research on the nanosize effect of hematite and ferrihydrite nanoparticles on their electronic, adsorption, catalytic, dispersion, and biochemical properties. We found that the nanosize-dependent crystallinity of the nanoparticles is behind the nanosize dependence of their electronic properties. This effect can explain the nanosize-dependence of the adsorption, dispersion, catalytic, and biochemical properties of the iron(III) (hydr)oxides. We have assessed these properties in the studies of the adsorption of carbonate and fatty acids, catalytic oxygenation of Mn(II), and bioactivity of the nanoparticles with respect to bovine chondrocytes. The found correlation between the catalytic and biochemical properties of the nanoparticles implies that the bioactivity is directly related to the redox potential and the catalytic redox mechanism (including either the deactivation or generation of reactive oxygen species) of the metal oxide nanoparticles toward redox active constituents at the biointerface.

Tailoring the (bio)activity of iron (hydr)oxide nanoparticles in abiotic and biotic environment

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.