Abstract
This works aims to investigate the influence of three different categories of silica, namely, precipitated silica, fumed silica and nanosilica prepared via sol-gel process, for hydrophobic application in this work. Nanosilica was characterised using scanning electron microscopy, Fourier transform infrared spectroscopy, particle size and zeta potential. Diluted silicone rubber (room-temperature vulcanising silicone) was also used as a matrix for these particles as (3/1) weight%; silicone rubber/silica. Cold spraying technique was applied to coat glass substrates. Fourier transform infrared analysis was applied to investigate the coating. SEM observation and particle size analysis established that the nanosize of silica is used with narrow-size distribution. Zeta potential analysis demonstrated the stability of nanoparticles at recorded average values of −41 to −50 mV. Wettability results showed that all types of silica incorporated into the silicone rubber present a hydrophobic surface. The maximum recorded value of contact angle was 146° for sol-gel-prepared silica/silicone rubber. The out findings indicated that these compounds are acceptable candidates for hydrophobic glass applications.
Highlights
Various industries, including biomedicine [1], filler [2], catalysis [3] and drug delivery systems [4], have shown increased interest and demand for silica nanoparticles in recent years
Particle size and uniformity exert a significant impact on the quality of nanosilica; demand for silica nanoparticles with limited and monodisperse-size distribution is high
Yeerken et al produced a self-cleaning aramid fabric using a two-step coating method with a readily accessible material system consisting of polytetrafluoroethylene (PTFE) and silica and a chemical-resistant layer with contact angles ranging from totally penetrating to 130°
Summary
Various industries, including biomedicine [1], filler [2], catalysis [3] and drug delivery systems [4], have shown increased interest and demand for silica nanoparticles in recent years. T. Yeerken et al produced a self-cleaning aramid fabric using a two-step coating method with a readily accessible material system consisting of polytetrafluoroethylene (PTFE) and silica and a chemical-resistant layer with contact angles ranging from totally penetrating to 130°. Reported that reducing glass surface contamination improves the performance of SiO2 nanoparticles as a superhydrophobic coating; a glass substrate coated with a superhydrophobic surface presents adjustable adhesion after altering with PDMS and using a water contact angle of 155.1° [17]. Jaafar prepared highly water-resistant and water-resistant nano-coating by electrospinning of polymer solution (PS/DMF, PMMA/THF) It was prepared with the addition of TiO2 nanoparticles. This work aims to prepare a hydrophobic coating that contains nanosilica and investigate the impact of silica type (fumed, precipitated and sol-gel-prepared silica) on the hydrophobicity of RTV coating on the glass substrate
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