Careful solid-state characterization couple with quantitative kinetics of reaction enables elucidation of how aggregation state influences nano particle reactivity. Particle surfaces play important roles in natural and engineered environmental systems, and aggregation state can dramatically change accessible surface area. Aggregation state is dynamic, and rates are sensitive to the dynamics of aggregation. Transitions between different states of aggregation (e.g., ranging from single-phase fractal aggregates to mesocrystals composed of oriented primary nanocrystals to heterogeneous aggregates of two or more phases) can be directly linked to evolving kinetics of redox reactions and phase transformation. Results from characterization using cryogenic transmission electron microscopy will be presented.

Dynamics of aggregation state of iron oxides in reactive solutions

246th National Meeting (2013)

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