On the Morphologic Character of the Superhydrophobic Solid Surfaces

Currently,super-hydrophobic surfaces with a water contact angle(CA) greater than 150° have attracted much interest for both fundamental research and practical applications because of their potential applications in daily life as well as in many industrial processes.The wettability of the solid surface is one of the characteristic property of materials and depends on both the chemical composition and the geometrical microstructure of the surface.Conventionally,super_hydrophobic surfaces have been produced mainly in two ways.One is to create a rough structure on a hydrophobic surface,and the other is to modify a rough surface by materials with low surface free energy.Since surface energy is an intrinsic property of each material,controlling the roughness of a solid surface is normally very important.It is indicated that the microstructures,nanostructures,especially the micro_and nanostructures on a solid surface are very important for the super_hydrophobicity of the solid surface.