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(Color online) (a) A microflower designed as an artificial iridophore based on capillary origami. Flexible reflective petals act as diffraction gratings reflecting incoming light (shown schematically as 3 beams). (b) Schematics representing the cross-section of a microflower with a captured droplet. (c) Schematics representing the contact line of a droplet on each petal, where total contact line .
(Color online) (a) Petal curvature radius R b (in units of L EC) as a function of contact angle θ −0, droplet radius R drop, and Cassie-Baxter fraction f 0. Dashed lines correspond to f 0 = 0.6, while solid lines correspond to f 0 = 0.8. Droplet radius R drop and Cassie-Baxter fraction f 0 are determined at the state when the droplet forms an ideal sphere with the petals completely wrapping the bottom half of the droplet. (b) Droplet and petal shapes for the cases of contact angle θ −0 = 70° and θ −0 = 145°. The results are shown for the droplet radius R drop = L EC.
(Color online) (a) Optical image of the top view of a microflower. (b) Part of a petal before release. (c) SEM image of the cross-section of a petal on LTO layer next to an array of Si nanograss before sacrificial etch. (d) The stem of a microflower anchored to the substrate. (e) Optical images of microflowers on nanograss substrate before oxidation and (g) after oxidation.
(Color online) (a) A microflower with a captured microdroplet. (b) Dependence of petal angle on liquid volume (only half of the frame is shown to facilitate comparison). As the amount of liquid captured by a microflower decreases the petal angle also decreases. (c) Schematics of an electrowetting process showing a droplet on the dielectric layer surrounding the conductive polycrystalline silicon petal of the microflower. (d) Electrowetting actuation of a microflower. The image shows the petal position without applied voltage, and the red dash lines indicate the petal positions with the voltage applied.
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