Hydrophobic surfaces composed of an asymmetric array of polymer nanorods show unidirectional wetting behaviour relative to the orientation of the tilted nanorods. The surfaces, which are smooth on the microscale, can transport water droplets of microlitre capacity by a ratcheting mechanism resulting from the pillared substrate.
- Niranjan A. Malvadkar
- Matthew J. Hancock
- Melik C. Demirel
