Resumen

MAGDALEON LOREDO, José Felix  y  CORNEJO MONROY, Delfino. Statistical influence of NH₄OH, number of layers and droplet volume in the development of ultra-hydrophobic coatings based on SiO₂ nanoparticles. Rev. cienc. tecnol. [online]. 2022, vol.5, n.1, e190.  Epub 14-Ago-2023. ISSN 2594-1925.  https://doi.org/10.37636/recit.v5n1e190.

Ultra-hydrophobic coatings are of interest in automotive, aeronautical and construction applications and in general in any area or surface where the use of highly water-repellent surfaces, with self-cleaning, anti-icing, and anti-corrosion properties is favorable. In recent years, various researchers have proposed different physical and chemical methods to obtain high-hydrophobic condition. In this article, the manufacture of a colloid based on SiO 2 nanoparticles is described to manufacture hydrophobic coatings with contact angles greater than 140º. With the help of a design of experiments and the manufacture of a colloid based on SiO 2 by the colloidal method, three factors were analyzed with their corresponding levels and their influence to maximize the contact angle. The fabricated colloid was sprayed and layered onto glass. In all the materials where the coating was applied, static contact angles (SCA) between 120º and 160º were obtained. Results by UV-Vis’s spectroscopy indicate that the transparency is greater than 68% and that this depends directly on the layers applied by spraying and on the quality of the film formed. The FT-IR spectra support the formation of SiO 2 nanoparticles, the presence of -OH groups in the different stages of the colloid manufacturing process, and C-F bonds. The composition and morphology were analyzed by field emission scanning electron microscopy (FESEM). FESEM micrographs were analyzed for the ultra-hydrophobic solutions and showed agglomeration of nanoparticles. As work in the future, it is proposed to analyze the wear resistance of coatings, their durability, and sliding angle, improving their hydrophobic properties.

Palabras llave : Ultra-hydrophobic coatings; Design of experiments; SiO₂ nanoparticles; Sol-gel method; Transparency.

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