Iron oxides are dynamic in both natural and engineered aqueous systems, with properties like phase composition, crystallinity, and crystal size and shape changing substantially as a function time and extent of reaction. The phases formed and the evolution of particle size and shape are exquisitely sensitive to solution conditions during aging, oxidative crystal growth, and reductive mineral dissolution. For example, the presence of organic matter (e.g., Suwanne River Natural Organic Matter) slows oxidative mineral growth on goethite nanocrystals, with greater suppression observed on the tips as compared to the sides of the prototypical acicular crystal. In a second example, oxidative mineral growth on hematite nanocrystals leads to the formation of hematite or goethite depending on pH, concentration of aqueous ferrous ion, and the presence (and concentration) of organic matter.  In a third example, the kinetics of phase transformation of akageneite to other phases depends on the presence of species like dissolved ions and organic matter as well as the solution pH. The presentation will highlight several examples of our ongoing work studying iron oxide nanoparticles in reactive, aqueous systems.<br/>

Iron oxide nanoparticles in reactive, aqueous solutions

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.