Figure 10
Effect of capillary-bridging on TPCL depinning. Sequential ESEM images (tilt angle = 25°) showing the droplet retraction during initial (a) and latter (b) stages of evaporation. During initial stages of droplet evaporation capillary-bridging is minimal and surface adhesion and depinning are a sole effect of contact-line fraction. The droplet retracted leaving a small trace of droplet which evaporated immediately (white dotted circle). In the latter stages, the droplet retracted from the micropillars leaving a big micro droplet (white dotted circle) on top of the micropillar due to strong capillary-bridging. The scale bar in (a,b) is 100 μm.
