Multifunctional micro/nano-patterned PTFE near-superamphiphobic surfaces achieved by a femtosecond laser

Near-superamphiphobic polytetrafluoroethylene (PTFE) surfaces exhibiting the robust multifunction capability of self-cleaning, anti-icing, anticorrosion, and mechanical stability were fabricated by femtosecond laser direct writing with no post-processing. The produced surface exhibited contact angles for water and glycol of 157° and 151°, respectively, and water and glycol droplets could easily roll on the laser-treated surface. Furthermore, the produced PTFE surface had an excellent self-cleaning ability demonstrated by depolluting dyed water and glycerol. In addition to these ordinary applications, the laser-treated surface displayed excellent anti-icing ability with good ice delay and icephobic performances. Meanwhile, we find that the near-superamphiphobic surface properties could be maintained following immersion for 2 days in solutions of 98% H2SO4, 10 mol/L NaOH, and 40% HF. Further, the obtained near-superamphiphobic surface demonstrated excellent mechanical stability under abrasion and bending tests. Such robust self-cleaning, ice-proof, and anticorrosive near-superamphiphobic surfaces will find diverse applications in industrial fields and in daily life.