Facilely etching of superhydrophobic surface with regular mulriple hierarchical micro-nano structures for crowning wettability

Nowadays, achieving highly effective superhydrophobic surfaces on chemically active magnesium alloys via a straightforward and efficient etching method remains a formidable task. In this study, we have successfully fabricated regular mulriple hierarchical micro-nano structures on AZ91D substrates through a one-step etching process. The resultant nano-chrysanthemums exhibit remarkable biomimicry wherein the extended nanostructures and the protrusions on them further enhance the air-liquid interface contact area. Subsequent to the modification, the contact and sliding angles of the samples achieved exceptional performance surpassing that of previous etching techniques. Furthermore, this low adhesion surface demonstrates commendable chemical stability even when exposed to air, chemically aggressive solutions (including strong acids and bases), and cyclic icing/melting treatments. Moreover, this versatile superhydrophobic surface exhibits exceptional resistance to various forms of contamination. The method employed to generate such advantageous superhydrophobic surfaces necessitates minimal equipment complexity and boasts substantial advantages in terms of affordability and efficiency. These characteristics not only confer promising prospects for widespread application but also render it suitable for large-scale industrial production.