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High aspect ratio cylindrical droplets of carbon-nanotube solutions present interesting hydrodynamic flow patterns during evaporation, where particles are aligned and positioned. The flow inside droplets with diameters <1000 nm positions all the nanotubes along the droplet centerline with 95% precision, while droplets with diameters >3µm align the nanotubes along the droplet edges during evaporation.
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Sharma et al. (2008) studied this question.
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