Figure 6
From: Long-range spontaneous droplet self-propulsion on wettability gradient surfaces
Three surfaces with arbitrary paths are designed for large volume droplet transport. The pattern density on these surfaces range from 0 to 1, and the CA gradient of the three surfaces are over 150°. (a) Droplet self-propulsion on annular path, which has an inner diameter of 3 mm and outer diameter of 20 mm, droplet could rotate about 210° around the center. (b) Droplet self-propulsion on straight path, the total length of the path is about 47 mm, and the droplet achieved a displacement of 37.5 mm (c) Droplet self-propulsion on ‘S’ shape path, the path has a length of 34 mm between two endpoints.
