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Water-repellent glass coated with SiO2–TiO2–methyltrimethoxysilane through sol–gel coating

1 Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281, Indonesia
2 Departement of Chemistry, Faculty of Science and Technology, Universitas Airlangga, Surabaya 60115, Indonesia

A hydrophobic coating for glass substrates was developed using SiO2, TiO2, and methyltrimethoxysilane (MTMS) to achieve low surface energy and a rough surface. The coating process was conducted using a sol–gel method and layer by layer deposition. The effect of SiO2, TiO2, and MTMS on the hydrophobicity and transparency of the coating were evaluated using contact angle and optical transmittance measurements, respectively. The transparency was found to decrease with higher moles of SiO2, TiO2, and MTMS; the water contact angle initially increased with increasing addition of these reagents, but then declined above the optimum conditions. The optimum conditions were determined to be at approximately 0.075, 0.030, and 0.002 mol of SiO2, TiO2, and MTMS, respectively. The resulting water contact angle was 115.56 ± 1.01°. SiO2 and TiO2 provided a synergistic effect to improve the roughness surface, as shown in the AFM data. The glass coated using SiO2–TiO2–MTMS exhibited higher hardness values than bare glass.
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Copyright Info: © 2019, Alfa Akustia Widati, et al., licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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