Producing superhydrophobic/oleophobic coatings on Cultural Heritage building materials
PURE AND APPLIED CHEMISTRY(2018)
摘要
Water is the main vehicle of decay agents in Cultural Heritage building materials exposed to weathering. In this work, a simple method to produce superhydrophobic/oleophobic coatings building materials, including under outdoors conditions, has been developed. In addition, a study of the behavior of the developed coatings on different substrates (limestone, granite, concrete and wood) is reported. The addition of 40 nm-SiO2 nanoparticles to a fluoroalkylsilane reduces surface energy and produces a Cassie-Baxter surface in all the materials evaluated. It promotes high static contact angle values of around 160 degrees, and a contact angle hysteresis of around 3 degrees, giving rise to repellence. The building surfaces also demonstrate an excellent self-cleaning performance. The coatings maintain the building materials esthetics as required in the Cultural Heritage field. Finally, the coating presents a long-lasting performance due to condensation reactions producing effective grafting to the four building materials evaluated.
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关键词
40-nm silica particles,building material,ChemCultHerit,Cultural Heritage,fluoroalkylsilane,long-lasting properties,oleophobicity,self-cleaning,superhydrophobicity
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