Here we show examples of self-propelled droplet motion induced by gradients in surface texture or hydrophobicity.

Self-propelled
Droplet Motion

Deop self-propelled in a circular path on SLIPS

Long-distance motion of droplets along complex paths can be designed using tapered slippery microrails.

Bidirectional Droplet
Motion

Schematic of surface exhibiting bidirectional motion

A droplet on tapered slippery microrails separated by a liquid lubricant may move either forwards or backwards.