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    Synthesis of mechanically durable transparent fluorine-free superhydrophobic surface by sol-gel method
    (İdris Karagöz, 2022) Okkay, Hikmet
    In this study, fluorine-free superhydrophobic transparent silica surfaces were produced by using 3-Aminopropyltriethoxysilane (APTES), Trimethoxymethylsilane (TMMS) and hydrophobic silica particles synthesized by sol-gel method in one step. The wettability performance was investigated using water droplet. TMMS-Silica and APTES-Silica composite solutions were prepared using different silica content from 0% to 30% by weight. The water contact angle values of the composite films vary depending on the % silica content, and the increase in the % silica content resulted in the water contact angle value increasing from 95o to 158o. It was observed that the mean roughness (RMS) of the thin film surface increased from 25 nm to 105 nm with increasing silica content of the composite solution. When the silica content of the composite films is 10% by weight (TMMS-10), the coating has an average roughness of 25 nm and a water contact angle value of 127o. It was observed that when the silica content was 30% by weight (TMMS-30), the average surface roughness was 105 nm, and the water contact angle was 158o. The increase in surface roughness caused by the silica content led to a decrease in the surface hardness. It was determined that the water contact angle of the composite surface did not change much, especially on TMMS-30 surfaces after chemical treatment. These results show that superhydrophobic transparent surfaces prepared with an environmentally friendly coating technique, especially TMMS-30, is suitable for many applications such as self-cleaning, oil/water separation, solar cells.