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Related Experiment Video

Updated: Jul 4, 2026

$Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction$

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction

Published on: April 1, 2017

Fractal substructure of a nanopowder.

Thomas Schwager¹, Dietrich E Wolf, Thorsten Pöschel

¹Charité, Augustenburger Platz 1, 13353 Berlin, Germany.

Physical Review Letters

|June 4, 2008

Summary

Repeatedly dispersing and settling nanopowder forms fractal structures. Simulations show these fractal agglomerates exhibit consistent packing density and fractal dimension, with relaxation time scaling with fragment size.

Area of Science:

Materials Science
Physics
Nanotechnology

Background:

Nanopowder structural evolution impacts material properties.
Fractal substructures can emerge from dynamic processes like dispersion and settling.
Understanding agglomerate formation is key to controlling material characteristics.

Purpose of the Study:

To investigate the structural evolution of nanopowders under repeated dispersion and settling.
To characterize the resulting fractal substructures and their properties.
To determine the influence of fragmentation scale on the final agglomerate structure and dynamics.

Main Methods:

Numerical simulations of a two-dimensional model agglomerate.
Utilizing adhesive rigid particles.

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Last Updated: Jul 4, 2026

$Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction$

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Published on: April 1, 2017

Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory

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Published on: March 7, 2018

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Implementing a fragmentation and settling procedure at a characteristic scale l.

Main Results:

Converged to a loosely packed structure.
Final packing density was independent of initialization.
Short-range correlation function was independent of fragment size.
Structure exhibited fractal behavior up to scale l with a fractal dimension near 1.7.
Relaxation time increased linearly with fragmentation scale l.

Conclusions:

Repeated dispersion and settling of nanopowders leads to predictable fractal substructures.
The fractal dimension and packing density are robust properties of the resulting agglomerates.
Fragmentation scale l is a critical parameter influencing the relaxation dynamics of these fractal structures.