Figure 1: False-colour images of various droplet shapes and patterns on micropillar surfaces.
From: High-resolution liquid patterns via three-dimensional droplet shape control
(a) Side- and top-view images of the droplet. The images on the left correspond to an advancing stage where the apparent contact angle is >90° and the actual contact line is not visible. The actual octagonal contact line is visible in the image on the right once the droplet evaporates in a global pinning mode and the apparent contact angle is <90°. The two side-view images acquired along the line-of-sight of 45° (second axes of symmetry, green dotted line) with respect to the pillar rows have been artificially rotated by 45°. The side-view images along with contact angles. (b) Different droplet shapes obtained by varying cylindrical micropillar array geometry. (c) The ability to pattern an array of microscopic droplets with excellent spatial control. Scale bar, 100 μm and the geometry is defined in Supplementary Table 1.
