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Title: Understanding the Role of Solvation Forces on the Preferential Attachment of Nanoparticles in Liquid

Journal Article · · ACS Nano
 [1];  [1];  [2];  [1];  [3];  [4]
  1. Univ. of California, Davis, CA (United States)
  2. Florida State Univ., Tallahassee, FL (United States)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Fundamental Computational Sciences Directorate

We discuss optimization of colloidal nanoparticle synthesis techniques, which requires an understanding of underlying particle growth mechanisms. Nonclassical growth mechanisms are particularly important as they affect nanoparticle size and shape distributions, which in turn influence functional properties. For example, preferential attachment of nanoparticles is known to lead to the formation of mesocrystals, although the formation mechanism is currently not well-understood. Here we employ in situ liquid cell scanning transmission electron microscopy and steered molecular dynamics (SMD) simulations to demonstrate that the experimentally observed preference for end-to-end attachment of silver nanorods is a result of weaker solvation forces occurring at rod ends. In conclusion, SMD reveals that when the side of a nanorod approaches another rod, perturbation in the surface-bound water at the nanorod surface creates significant energy barriers to attachment. Additionally, rod morphology (i.e., facet shape) effects can explain the majority of the side attachment effects that are observed experimentally.

Research Organization:
Univ. of California, Davis, CA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
FG02-03ER46057; AC05- 76RL01830; NSF-1334012
OSTI ID:
1252731
Journal Information:
ACS Nano, Vol. 10, Issue 1; ISSN 1936-0851
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 45 works
Citation information provided by
Web of Science

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Directional Statistics of Preferential Orientations of Two Shapes in Their Aggregate and Its Application to Nanoparticle Aggregation text January 2017
Nanoparticle Interactions Guided by Shape-Dependent Hydrophobic Forces journal March 2018
Quantitative Mapping of Nanoscale Chemical Dynamics in Sub-Sampled Operando (S)TEM Images using Spatio-Temporal Analytics journal May 2018
Nanoparticle Superlattices: The Roles of Soft Ligands journal September 2017
Oriented Growth of α-MnO2 Nanorods Using Natural Extracts from Grape Stems and Apple Peels journal May 2017
Investigating materials formation with liquid-phase and cryogenic TEM journal June 2016
Controlling the spatio-temporal dose distribution during STEM imaging by subsampled acquisition: In-situ observations of kinetic processes in liquids journal August 2019
Dynamics of Templated Assembly of Nanoparticle Filaments within Nanochannels journal July 2017
Automating material image analysis for material discovery journal April 2019
Observing the colloidal stability of iron oxide nanoparticles in situ journal January 2019
Directional Statistics of Preferential Orientations of Two Shapes in Their Aggregate and Its Application to Nanoparticle Aggregation text January 2017
Directional Statistics of Preferential Orientations of Two Shapes in Their Aggregate and Its Application to Nanoparticle Aggregation journal May 2018
Imaging the polymerization of multivalent nanoparticles in solution journal October 2017
Direct Observation of Early Stages of Growth of Multilayered DNA-Templated Au-Pd-Au Core-Shell Nanoparticles in Liquid Phase journal February 2019