One-pot fabrication of fluoride-silica@silica raspberry-like nanoparticles for superhydrophobic coating

A facile and effective method to fabricate raspberry-like nanoparticles is reported in a one-pot reaction. This method consists of two steps: preparation of silica nanoparticle precursors dispersion via the Stober process and growth of the tiny functional fluoride-silica nanoparticles on the surface of silica nano particle precursors via the hydrolysis-condensation reaction of tetraethoxysilane (TEOS) and 1H,1H,2H,2H-Perfluorodecyl triethoxysilane (HDFTES). The obtained raspberry-like nanoparticle dispersion could be spray coated onto different substrates directly with the water contact angle greater than 150 and water roll-off angle less than 4. And the prepared coatings maintained water resistance after water jetting, sand abrasion. This method can be an effective strategy for fabricating superhydrophobic surfaces for practical industrial applications. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.