Figure 3: Modelling of local contact line pinning.
From: High-resolution liquid patterns via three-dimensional droplet shape control
(a) Schematic of the advancing contact line movement via the Cassie–Baxter15 mode on a chemically patterned surface. The background surface ‘2’ is relatively more wetting than the circular defects ‘1’, and hence, the contact line is distorted due to local pinning on ‘1’. (b) Similarly for the Wenzel19 droplet on the right, the relatively large depinning contact angles at the pillar edges (θF,A+90°) result in local pinning and contact line distortion.
