Figure 2
From: Path-programmable water droplet manipulations on an adhesion controlled superhydrophobic surface
Vacuum induced local dimple formation on the PDMS substrate with micro-pillar arrays.
(a) Photographic images and schematic illustrations of the local dimple formation on the substrate using a vacuum tip. Scale bar, 5 mm. (b) Cross-sectional photographic image of the negative replica of the dimple structure. PDMS substrate is uniformly stretched by the applied vacuum pressure. Scale bar, 1 mm. (c) Typical SEM image of the duplicated dimple structure. Scale bar, 30 μm. (d) SEM images of the micro-pillar arrays taken from the flat region (i), negative curvature region (ii) and positive curvature region (iii). Scale bar, 5 μm.
