Superhydrophobic coatings fabricated with polytetrafluoroethylene and SiO2 nanoparticles by spraying process on carbon steel surfaces

- The SiO2 and PTFE NP-filled coatings exhibit excellent superhydrophobicity.
- PTFE-filled coatings show denser structures and better liquid resistance than SiO2.
- Air pocket of Wentzel model explains the difference in the superhydrophobicity.