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Self-coating of an evaporating droplet of water placed on (i) hydrophobic sand [panels (a)–(d)] and (ii) trimethylsilyl chloride coated silica particles of diameter [panels (e)–(h)].
Evaporation of a water droplet from a bed of diameter hydrophobic silica spheres. The plus symbols (+++) show the height of the skin, , formed by the spheres, the crosses (xxx) show the droplet spherical radius , and their product is shown by the circles (ooo).
(Color online) Aggregate of blue hydrophobic spheres surrounding transparent hydrophilic spheres after the formation of clumps during evaporation.
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