氨气腐蚀法制备黏附性能可控的超疏水铜表面

Super-hydrophobic Copper Surface with Controlled Adhesion Prepared via Ammonia Corrosion

采用简单便捷的方法制备出了具有不同黏附性能的超疏水表面.通过控制氨气对金属铜表面的腐蚀时间,分别制备了具有微米球及微米棒状结构的表面.利用低表面能氟硅烷(FAS)修饰后,2种表面均表现出超疏水特性(接触角均大于150°),然而其黏附性能却截然相反.具有微球结构的表面呈现出高黏附特性,而具有微米棒状结构的表面则显示出低黏附特性.研究发现,表面不同的微观结构导致了液滴在其表面上分别处于Cassie-impregnating wetting态及Cassie态,从而呈现出了不同的黏附性能.

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.