An underwater stable superhydrophobic surface for robust ultra-long-lasting biofouling resistance

An underwater stable superhydrophobic surface that displays a very low affinity to water and microorganisms is urgently required in marine engineering and offshore constructions. In this study, we demonstrated an under-water stable superhydrophobic surface with pressure resistance, chemical stability, biocompatibility, and biofouling resistance. The surface demonstrated superhydrophobicity under a water pressure of 13.72 kPa for up to 27 days. To examine the anti-biofouling property of the surface, the as-prepared samples were submerged in a natural lake for 50 days. The surface could withstand water flush and biological attacks for more than 35 days. The mechanical stability of the surface was evaluated by a sandpaper scratching test. An abrasion length of 12 m would not decrease the water contact angle of the surface, which is superior over the state-of-the-art coatings based on candle soot networks. The stable long-lasting underwater superhydrophobic surface is of great importance to marine applications.

Automated summary

In this study, a stable superhydrophobic surface with pressure resistance, chemical stability, biocompatibility, and biofouling resistance was demonstrated. The surface maintained superhydrophobicity under a water pressure of 13.72 kPa for 27 days and could withstand water flush and biological attacks for over 35 days. The mechanical stability of the surface was superior to state-of-the-art coatings. The stable long-lasting underwater superhydrophobic surface is of great importance to marine applications.