In situ preparation of recoverable superhydrophobic coatings for various environments

A superhydrophobic coating was synthesized by in-situ reaction of fumed silica nanoparticles and a co-precursor which contains methyltrimethoxysilane (MTMS), propyltrimethoxysilane (PTMS), and diphenyldimethoxysilane (DPDS). The superhydrophobic surface was achieved by the spray of above mixtures on the substrates. Micro/nano structure of the surface was controlled by the silica nanoparticles. The wetting behavior of the surface was enhanced after coated and obtained a maximum 154o static water contact angle and a minimum 1o sliding angle. The surface retained its superhydrophobicity as well as good corrosive resistance and adhesion at a high temperature of 460 °C. Damage to the superhydrophobic coatings caused by extremely low temperature or mechanical force could be easily repaired through a heat treatment or a new spray.