Synthesis of mechanically durable transparent fluorine-free superhydrophobic surface by sol-gel method

Öz

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.

Anahtar Kelimeler

• Superhydrophobic
• Fluorine-free
• Sol-gel
• Trimethoxymethylsilane
• Transparent

Sol-jel yöntemiyle flor içermeyen mekanik olarak dayanıklı şeffaf süperhidrofobik yüzey sentezi

Öz

Bu çalışmada, tek adımda sol-jel yöntemiyle sentezlenmiş 3-Aminopropiltrietoksisilan (APTES), Trimetoksimetilsilan (TMMS) ve hidrofobik silika partikülleri kullanılarak, flor içermeyen süperhidrofobik şeffaf silika yüzeyler üretilmiştir. Islanabilirlik performansı, su damlası kullanılarak incelenmiştir. TMMS-Silika ve APTES-Silika kompozit çözeltileri, ağırlıkça %0'dan %30'a kadar farklı silika içeriği kullanılarak hazırlanmıştır. Kompozit filmlerin su temas açısı değerleri, % silika içeriğine bağlı olarak değişmekte ve %silika içeriğindeki artış, su temas açısı değerinin 95o den 158o ye çıkması ile sonuçlanmıştır. Kompozit çözeltinin silika içeriğinin artmasıyla, ince film yüzeyinin ortalama pürüzlülüğünün (RMS) 25 nm'den 105 nm'ye yükseldiği gözlenmiştir. Kompozit filmlerin silika içeriği ağırlıkça %10 (TMMS-10) olduğunda, kaplamanın ortalama 25 nm pürüzlülüğe ve 127o su temas açısı değerine sahip olduğu, silika içeriği ağırlıkça %30 olduğunda ise ortalama yüzey pürüzlülüğünün 105 nm'ye ve su temas açısının 158o ye ulaştığı gözlenmiştir. Silika içeriğinden kaynaklanan yüzey pürüzlülüğündeki artış, yüzey sertliğinin azalmasına yol açmıştır. Kimyasal işlemden sonra kompozit yüzeyin su temas açısının, özellikle TMMS-30 yüzeylerinde çok fazla değişmediği belirlenmiştir. Bu sonuçlar, TMMS-30 başta olmak üzere çevre dostu bir kaplama tekniği ile hazırlanan süperhidrofobik şeffaf yüzeylerin, kendi kendini temizleme, yağ/su ayırma, güneş pilleri gibi birçok uygulama için kullanımının uygun olduğunu göstermektedir.

Anahtar Kelimeler

• Süperhidrofobik
• Flor içermeyen
• Sol-jel
• Trimetoksimetilsilan
• Şeffaf

Teşekkür

Karakterizasyon için gerekli olan analizlerin yapılmasındaki katkılarından dolayı, Çanakkale Onsekiz Mart Üniversitesi, Kimya Mühendisliği Bölümü Öğr. Üyesi Doç. Dr. Uğur CENGİZ’e teşekkürlerimi sunarım.

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