Abstract
A kinetic Monte Carlo simulation of nanoparticle film formation via nanocolloid drying is presented. The proposed two-dimensional model addresses the dynamics of nanoparticles in the vertical plane of a drying nanocolloid film. The gas–liquid interface movement due to solvent evaporation was controlled by a time-dependent chemical potential, and the resultant particle dynamics including Brownian diffusion and aggregate growth were calculated. Simulations were performed at various Peclet numbers defined based on the rate ratio of solvent evaporation and nanoparticle diffusion. At high Peclet numbers, nanoparticles accumulated at the top layer of the liquid film and eventually formed a skin layer, causing the formation of a particulate film with a densely packed structure. At low Peclet numbers, enhanced particle diffusion led to significant particle aggregation in the bulk colloid, and the resulting film structure became highly porous. The simulated results showed some typical characteristics of a drying nanocolloid that had been reported experimentally. Finally, the potential of the model as well as the remaining challenges are discussed.
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This work was supported by JSPS KAKENHI Grant Number 16K21032 (Grant-in-Aid for Encouragement of Young Scientists (B)).
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Kameya, Y. Kinetic Monte Carlo simulation of nanoparticle film formation via nanocolloid drying. J Nanopart Res 19, 214 (2017). https://doi.org/10.1007/s11051-017-3898-3
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DOI: https://doi.org/10.1007/s11051-017-3898-3