Formation of fractal structures upon the evaporation of nanoparticle dispersion droplets
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The regularities of the self-organization of silver nanoparticles on solid substrates upon the evaporation of droplets of their aqueous dispersions were studied. The evaporation rate of the dispersion medium varied within a wide range. Upon a slow evaporation of the dispersion medium, a dense ring-like precipitate is formed around the droplet perimeter, where almost all particles are accumulated. In the vicinity of a rim, an ordered nanoparticle arrangement was observed. As the evaporation rate of the dispersion medium increases, most of the silver nanoparticles remain in the inner zone, limited by a rather dense rim, and form 2D fractal structures. At some regimes of droplet evaporation, 3D fractal structures were assembled whose shape depended on the substrate nature.
KeywordsEvaporation Silver Nanoparticles Dispersion Medium Evaporation Rate Solid Substrate
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