TY - JOUR
T1 - Moving reaction fronts in fractal nanoparticle agglomerates
AU - Jin, Wenjie
AU - van Ommen, J. Ruud
AU - Kleijn, Chris R.
PY - 2019/10/12
Y1 - 2019/10/12
N2 - 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 Df<3 may therefore be orders of magnitude smaller than for non-fractal porous materials.
AB - 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 Df<3 may therefore be orders of magnitude smaller than for non-fractal porous materials.
KW - Atomic layer deposition
KW - Knudsen diffusion
KW - Nanoparticle agglomerate
KW - Self-limiting surface reaction
UR - http://www.scopus.com/inward/record.url?scp=85066096668&partnerID=8YFLogxK
U2 - 10.1016/j.ces.2019.05.027
DO - 10.1016/j.ces.2019.05.027
M3 - Article
AN - SCOPUS:85066096668
SN - 0009-2509
VL - 206
SP - 180
EP - 186
JO - Chemical Engineering Science
JF - Chemical Engineering Science
ER -