In situ preparation of recoverable superhydrophobic coatings for various environments

摘要

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. Microano structure of the surface was controlled by the silica nanoparticles. The wetting behavior of the surface was enhanced after coated and obtained a maximum 154(o) static water contact angle and a minimum 1(o) sliding angle. The surface retained its superhydrophobicity as well as good corrosive resistance and adhesion at a high temperature of 460 degrees 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.