Preparation of a Janus copper mesh via nanoparticle interface self-assembly for unidirectional water transportation.

A simple colloidal particle interface assembly method is presented to fabricate Janus meshes. The transport mechanism of water on the Janus mesh was fully revealed by experimental observation and numerical simulation. Furthermore, a liquid-assisted ultrafast transport of water droplets on the Janus mesh was presented (transport speed was increased by more than 20 times).