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. 2017 Mar 29;7:500. doi: 10.1038/s41598-017-00497-x

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© The Author(s) 2017

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Mechanism of the PEG-induced Marangoni vortex. (a) Schematic image of the suspended particles and fluidic motion in the evaporating droplet system. (b) A profile of the PEG concentration by position. (c) A profile of the surface tension. (d) A profile of the viscosity. The expanded profiles near the edge are shown as the insets of each figure.