Fabrication and characterization of stable superhydrophobic surface with good friction-reducing performance on Al foil

A lotus-leaf-like hierarchical structure was successfully created on Al foil by a facile three-step solution-immersion method. As-obtained etched-immersed Al/STA rough surface contains interconnected convex-concave micro-structure and uniformly distributed nano-sheets that endow the surface with excellent superhydrophobicity (WCA: 164.2°; WSA: below 5°). Besides, the as-prepared etched-immersed Al/STA superhydrophobic surface on Al foil exhibits good friction-reducing ability and stable superhydrophobicity.