Moving reaction fronts in fractal nanoparticle agglomerates

Journal article (2019)

Authors

W. Jin ChemE/Product and Process Engineering -

J.R. van Ommen ChemE/Product and Process Engineering -

C.R. Kleijn ChemE/Transport Phenomena -

Research Group

ChemE/Product and Process Engineering () (TU Delft)

Atomic layer deposition Knudsen diffusion Nanoparticle agglomerate Self-limiting surface reaction

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Published Date

12-10-2019

Language

English

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Product and Process Engineering

Abstract

Self-limiting gas-surface reactions lead to reaction fronts that penetrate nanoporous materials with a finite speed. We present a closed form theoretical model, validated against molecular simulations, that shows the influence of the fractal scaling law on the time needed to fully penetrate fractal agglomerates of nanoparticles. For very large agglomerate sizes, this penetration time scales with the number of particles N in the agglomerate as [Fourmula presented]. The penetration time for agglomerates with fractal dimensions D_f<3 may therefore be orders of magnitude smaller than for non-fractal porous materials.

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