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Flower-like particles. (a) An SEM image of a particle, showing its flowerlike morphology. (b) A TEM image of two particles, showing that they are spheres of in diameter with thick distorted plates on the surface. (c) TEM image taken at the edge of a plate, showing that the thin plate is composed of interconnected crystals of about in diameter. (d) XRD pattern of the synthesized particles, indicating that the particles consist of crystals.
(Color online) Superhydrophobic surfaces fabricated by packing the flowerlike particles. (a) A typical SEM image of the surface. The topography of the surface consists of structures in multiple length scales—the roughness caused by the thin plates, or “petals,” on each particle is superimposed onto a larger scale roughness induced by packing the particles. (b) Optical image of a water droplet on the surface with a WCA of . Inset is an optical image of the water droplet during the WCA measurement. (c) Schematic cross-sectional profile of water in contact with the flowerlike particles. (d) Schematic cross-sectional profile of water in contact with a solid indent consisting of overhanging structures.
Results of WCA measurements on surfaces made by packing particles with different morphologies before and after aging treatments.
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