Tribology of silica nanoparticle-reinforced, hydrophobic sol–gel composite coatings

摘要: Abstract Hydrophobically functional coatings can be used to protect surfaces and therefore improve the performance lifetime of a broad range applications such as optoelectronics touchscreens. Organic–inorganic hybrid materials silica sol–gel are particularly effective for this purpose, but molecules in these susceptible abrasive wear thus lose their over time harsh environments typically encountered. To combat problems, nanoparticle-reinforced matrix was developed increase hardness resistance overall coating. This study involved analysis fluorinated composite particle reinforced dip-coated on glass substrates. Varying amounts nanoparticles from 0.5 10 wt.% precursor weight were added examine structural dependence mechanisms elucidate strengthening that could lead improvements coating properties. Abrasion conducted using an in-house built reciprocating polishing apparatus. Characterization water contact angle determine hydrophobic functionality after cycles. Atomic force microscopy, lateral nanoindentation, nano-scratch, goniometry, optical microscopy performed at intervals testing characterize degradation It generally found that, among other possible factors, increased indentation led decreased rate. Additionally, optimal amount colloidal 1–2 wt.% precursors provided best mechanical, tribological, performance.