Superhydrophobicity frommicrostructured surface

Superhydrophobicity is referred to the wet- tability of a solid surface which has a water apparent contact angle greater than 150 . It has attracted great interest in both fundamental researches and practical applications. This pa- per discusses two models: Wenzel model and Cassie model, to describe the superhydrophobic states of surface. The ef- fects of surface morphology and microstructure on superhy- drophobicity are discussed, and the internal relationship between Wenzel and Cassie states is presented. These two superhydrophobic states can coexist and they present differ- ent properties on contact angle hysteresis. It is reported that the irreversible transition can be realized from Cassie state to Wenzel state under some certain conditions. This paper also gives a review of recent progresses in the strategies of fabricating superhydrophobic surfaces by designing micro- structured or microtextured surfaces. Finally, the funda- mental research and applications of superhydrophobic sur- faces are prospected.