Impact of Solution Chemistry and Particle Anistropy on the Collective Dynamics of Oriented Aggregation
- BATTELLE (PACIFIC NW LAB)
- UNIVERSITY OF WASHINGTON
- WASHINGTON STATE UNIV
- Oak Ridge National Laboratory
Although oriented aggregation of nanoparticles is a widely recognized mechanism of crystal growth, the impact of many fundamental parameters, such as crystallographically distinct interfacial structures, solution composition, and particle-shape-specific hydrodynamic characteristics, on the governing mechanisms and assembly kinetics are largely unexplored. In this context, we investigated the structure and dynamics of boehmite aggregation as a function of solution pH and ionic strength. Cryogenic transmission electron microscopy shows that boehmite platelets assemble by oriented attachment on (010) planes. The coagulation rate constants obtained from dynamic light scattering during the early stages of aggregation are found to span seven orders of magnitude and cross both the reaction-limited and diffusion-limited regimes. Combining a simple scaling with calculations for stability ratio and rotational/translational diffusivities of irregular particle shapes, the effects of orientation for irregular-shaped particles on the early stages of aggregation is understood via angular dependence of van der Waals, electrostatic, and hydrodynamic interactions. Using Monte Carlo simulations, we found that a simple geometric parameter, namely the contact area between two attaching platelets, provides physical insight into the unique structural characteristics of the larger aggregates of the irregular-shaped particles, explaining the unusually high fractal dimensions measured in the diffusion-limited aggregation regime.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Interfacial Dynamics in Radioactive Environments and Materials (IDREAM); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1526997
- Report Number(s):
- PNNL-SA-132757
- Journal Information:
- ACS Nano, Vol. 12, Issue 10
- Country of Publication:
- United States
- Language:
- English
Interplay between Short- and Long-Ranged Forces Leading to the Formation of Ag Nanoparticle Superlattice
|
journal | June 2019 |
Quantized grain boundary states promote nanoparticle alignment during imperfect oriented attachment | preprint | January 2020 |
Similar Records
Predicting Outcomes of Nanoparticle Attachment by Connecting Atomistic, Interfacial, Particle, and Aggregate Scales
Simulation of radioactive plume transport in the atmosphere including dynamics of particle aggregation and breakup