Super-hydrophobic copper surface with controlled adhesion prepared via ammonia corrosion

In this paper, we report a novel ammonia corrosion strategy for preparation of the super-hydrophobic copper surface with controlled adhesion. Surfaces with ball-like structure or rod-like structure can be achieved by simply changing the corrosion time. After modification by the low surface energy material fluoroalkylsilane(FAS), both the two surfaces show super-hydrophobic property, but the adhesive properties are rather different, the surface with ball-like structure shows high adhesion and the surface with rod-like structure shows low adhesion. The difference is ascribed to the different wetting states: Cassie-impregnating wetting state and Cassie state for droplets on the surface resulted from the different microstructures.