Novel superhydrophobic and highly oleophobic PFPE-modified silica nanocomposite

Superhydrophobic and highly oleophobic surface with micro-nanoscale binary structure (MNBS) was fabricated on the glass substrates with nano-silica modified by perfluoropolyether (PFPE) derivative. It was found that the formation of the MNBS and the modification of nano-silica by functionalized PFPE can be achieved simultaneously. The reaction time for preparing the fluorinated silica from nano-silica and functionalized PFPE plays an important role in the water and oil repellency of the coating surface. The maximum static water contact angle of this coating surface was 151.4° and its hysteresis was 2.9°, while for tetradecane it was 132.2° and 20.5°, respectively. Furthermore, the thermal property of the surface was also investigated. The main thermal weight loss proceeded from 241.7 °C and the total weight loss of the fluorinated silica was less than 30% even when heated to 800 °C.