Fig. 1: Spontaneous droplet motion on liquid-infused surfaces with topographical gradient.
From: Bidirectional motion of droplets on gradient liquid infused surfaces
a Water droplet on ionic liquid-infused surface moves toward sparser solid area, while for b Krytox-infused surface, the water droplet moves toward denser solid area. For the two cases, only the lubricant is changed. The dashed shapes represent the initial position of the droplets, and the arrows the direction of motion of the droplets.
