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Connecting energetics to dynamics in particle growth by oriented attachment using real-time observations

Chemistry

Connecting energetics to dynamics in particle growth by oriented attachment using real-time observations

L. Liu, E. Nakouzi, et al.

This research by Lili Liu and colleagues explores the fascinating crystal growth mechanism of oriented attachment (OA) in ZnO nanocrystals. The study uncovers how electrostatic forces and dipolar interactions play a significant role in driving OA, with the capacity to influence particle alignment at distances greater than 5 nm. Discover the profound dynamics of nanocrystal assembly revealed through in situ TEM observations combined with simulations.

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Playback language: English
Abstract
Oriented attachment (OA), a crucial crystal growth mechanism, involves face-specific attractions between nanocrystals. This study uses ZnO as a model to connect in situ TEM observations of single-particle and ensemble assembly dynamics with simulations of interparticle forces. The research reveals that OA is driven by forces and torques from electrostatic ion-solvent correlations and dipolar interactions, acting at distances exceeding 5 nm. Co-alignment precedes strong attractions leading to contact. The negligible attachment barrier and unusual diffusivities in the TEM fluid cell enable OA dominance.
Publisher
Nature Communications
Published On
Feb 25, 2020
Authors
Lili Liu, Elias Nakouzi, Maria L. Sushko, Gregory K. Schenter, Christopher J. Mundy, Jaehun Chun, James J. De Yoreo
Tags
oriented attachment
nanocrystals
ZnO
electrostatic forces
crystal growth
in situ TEM
assembly dynamics

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