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Synthesis and Characterization of Superhydrophobic-Superoleophobic and Anti-Corrosion Coatings via Sol-Gel Process

Superoleophobic nanocomposite coatings with improved 
hydrophobic properties were obtained by incorporation of a perfluoroalkyl 
polymer in hybrid sol-gel matrix containing silica and titania nanoparticles. 
SiO2 and TiO2 nanoparticles were synthesized based on 
sol-gel precursors utilizing tetraethyl orthosilicate, 3-glycidoxypropyl 
trimethoxysilane, and tetra (n-butyl orthotitanate). SEM and EDX images of the 
coating demonstrated that a Silica nanosphere had been aggregated in 
superporous structure. The analysis results show that nano-sized inorganic 
particles (10 - 20 nm) have a uniform distribution and dispersion. By increasing the PFOTES, the 
oleophobicity of coatings increased due to lowering of surface energy in the 
presence of fluoropolymer. Results of EIS measurement show that PFOTES and TiO2 nanoparticles increased anti-corrosion property of hybrid coatings. This method 
introduces a simple way to produce water- and oil-repellent self-cleaning 
coatings on large areas of different substrates like glass, ceramic, metal and 
composites.