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Title: Impact of Solution Chemistry and Particle Anistropy on the Collective Dynamics of Oriented Aggregation

Abstract

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.

Authors:
 [1]; ORCiD logo [1];  [2]; ORCiD logo [1];  [1];  [3]; ORCiD logo [1];  [4];  [1]; ORCiD logo [1]
  1. BATTELLE (PACIFIC NW LAB)
  2. UNIVERSITY OF WASHINGTON
  3. WASHINGTON STATE UNIV
  4. Oak Ridge National Laboratory
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Interfacial Dynamics in Radioactive Environments and Materials (IDREAM); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1526997
Report Number(s):
PNNL-SA-132757
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 12; Journal Issue: 10
Country of Publication:
United States
Language:
English
Subject:
oriented aggregation, boehmite, attachment, nanoplatelets

Citation Formats

Nakouzi, Elias, Soltis, Jennifer A., Legg, Benjamin A., Schenter, Gregory K., Zhang, Xin, Graham, Trenton R., Rosso, Kevin M., Anovitz, Lawrence M., De Yoreo, James J., and Chun, Jaehun. Impact of Solution Chemistry and Particle Anistropy on the Collective Dynamics of Oriented Aggregation. United States: N. p., 2018. Web. doi:10.1021/acsnano.8b04909.
Nakouzi, Elias, Soltis, Jennifer A., Legg, Benjamin A., Schenter, Gregory K., Zhang, Xin, Graham, Trenton R., Rosso, Kevin M., Anovitz, Lawrence M., De Yoreo, James J., & Chun, Jaehun. Impact of Solution Chemistry and Particle Anistropy on the Collective Dynamics of Oriented Aggregation. United States. https://doi.org/10.1021/acsnano.8b04909
Nakouzi, Elias, Soltis, Jennifer A., Legg, Benjamin A., Schenter, Gregory K., Zhang, Xin, Graham, Trenton R., Rosso, Kevin M., Anovitz, Lawrence M., De Yoreo, James J., and Chun, Jaehun. 2018. "Impact of Solution Chemistry and Particle Anistropy on the Collective Dynamics of Oriented Aggregation". United States. https://doi.org/10.1021/acsnano.8b04909.
@article{osti_1526997,
title = {Impact of Solution Chemistry and Particle Anistropy on the Collective Dynamics of Oriented Aggregation},
author = {Nakouzi, Elias and Soltis, Jennifer A. and Legg, Benjamin A. and Schenter, Gregory K. and Zhang, Xin and Graham, Trenton R. and Rosso, Kevin M. and Anovitz, Lawrence M. and De Yoreo, James J. and Chun, Jaehun},
abstractNote = {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.},
doi = {10.1021/acsnano.8b04909},
url = {https://www.osti.gov/biblio/1526997}, journal = {ACS Nano},
number = 10,
volume = 12,
place = {United States},
year = {2018},
month = {10}
}

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