Fabrication of bismuth superhydrophobic surface on zinc substrate

The dendritic Bi/Bi2O3/ZnO superhydrophobic surface (SHPS) was facilely obtained on zinc substrate via etching in 0.5 mol L-1 HCl solution for 2 min, immersing in 2 mmol L-1 Bi(NO3)(3)/0.1 mol L-1 HNO3 solution for 2.5 min and annealing treatment at 180 degrees C for 2 h. The wetting property results demonstrated that the superhydrophobic sample had excellent water-repellency with a static water contact angle of similar to 160 degrees and sliding angle of similar to 0 degrees under the optimum condition, which can be visually confirmed by the impacting droplet could rebound back immediately and roll off the horizontally placed sample. Moreover, it exhibited remarkable selfcleaning ability, buoyancy, desired stability in long-term storage in air, corrosion resistance in 3.5 wt% NaCl solution, ice-over delay at - 16 degrees C and durability in lab-simulated abrasion test.