Oriented Graphene Foam with Tunable Wettability by Electrocapillary for Switchable and Ultra-Fast Imbibition

Electrocapillary endows an oriented graphene foam (OGF) with tunable wettability for efficient imbibition. By applying a small negative potential, OGF can be transformed from hydrophobic to hydrophilic. Thanks to its large pore sizes and much less tortuous channels, OGF shows switchable imbibition with an extremely high dynamic rate.