Synthesis of aerogel coatings and investigation of anti-icing performances
Küçük Resim Yok
Tarih
2023
Yazarlar
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Cilt Başlığı
Yayıncı
Ege Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Buzlanma hava araçlarından güneş panellerine, rüzgâr türbinleri ve elektrik hatlarına kadar birçok sistemde çeşitli problemlere (güvenlik zafiyetleri, proses durması, arıza, ekipman ömründe kısalma, ekonomik kayıplar vb.) neden olmaktadır. Hayatımızın birçok alanında karşılaştığımız buzlanma problemi için buzlanma önleyici/geciktirici kaplamaların geliştirilmesi etkili bir yöntemdir. Bugüne kadar yapılan çalışmaların çoğunluğu yüzeylere su iticilik (hidrofobiklik) özelliğinin kazandırılmasının beraberinde buzlanmazlık özelliğini getirmesine odaklanmıştır. Bu çalışmalar, hidrofobik yüzey tasarımında yüzey mikro-nano pürüzlülüğünün etkili bir strateji olduğu düşüncesine dayanmaktadır. Ancak son zamanlarda süperhidrofobik yüzeylerin pürüzlülüğünün farklı çevresel koşullarda buz oluşumunu önlemede yetersiz kaldığını ortaya konmuştur. Diğer bir etkili strateji ise yağlayıcı ile aşılanmış gözenekli destek kullanımıdır. Bu stratejide de yağlayıcının zamanla yüzeyi terk etmesi ile istenilen özellikler yitirilmektedir. Bu çalışmada, buzlanmaz yüzey tasarımında etkili oldukları düşünülse de zafiyetleri bulunan bu iki yöntem birlikte kullanılarak hibrit bir yüzey kaplaması tasarlanmıştır. Ortaya çıkan sinerji ile iki yöntemin dezavantajlarının elimine edilmesi amaçlanmıştır. Bu amaç doğrultusunda, buzlanma önleyici/geciktirici, çok işlevli aerogel kaplamalar sol-jel yöntemiyle sentezlenmiş ve cam yüzeylere kaplanmıştır. Hazırlanan kaplamaların Fourier Dönüşümlü Kızılötesi Spektroskopisi (FTIR), Taramalı Elektron Mikroskobu (SEM), temas açısı analizleri ile karakterizasyonları gerçekleştirilmiştir. Buzlanmazlık özelliklerinin incelenmesine yönelik, tasarlanan buz adezyon cihazı ile yüzeylerdeki buz adezyon kuvvetleri ölçülerek sonuçlar incelenmiştir. Sentezlenen hibrit kaplamalar ile buz adezyon mukavemeti kaplamasız cama göre %88,6'ya kadar düşürülmüştür. Bu yüksek lisans tez çalışmasında sentezlenen çift katlı hibrit silika aerojel kaplamaların buzlanmaz yüzey tasarımında ümit vaat edici adaylar olabileceği sonucuna varılmıştır.
Icing causes various problems (security weaknesses, process stoppages, malfunctions, shortening of equipment life, economic losses, etc.) in many systems from aircraft to solar panels, wind turbines and power lines. The development of anti-icing/ice-phobic coatings is an effective method for the icing problem we encounter in many areas of our daily lives. Most of the studies carried out to date have focused on providing the ice-phobic feature due to the water repellency (hydrophobicity) of surfaces. These studies are based on the idea that surface micro-nano roughness is an effective strategy in hydrophobic surface design. Recently, however, it has been demonstrated that the roughness of superhydrophobic surfaces is insufficient to prevent ice formation under different environmental conditions. Another effective strategy is the use of slippery liquid infused porous structures. In this strategy, the desired properties are lost as the lubricant leaves the surface over time. In this study, a hybrid surface coating was designed by using these two strategies together, which are thought to be effective in ice-phobic surface design but have drawbacks. It is aimed to eliminate these disadvantages of the two strategies with the resulting synergistic effect due to the hybrid approach. For this purpose, anti-icing/ice-phobic, multifunctional aerogel coatings were synthesized by sol-gel method and coated on glass surfaces. The characterizations of the prepared coatings were carried out by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), contact angle analysis. In order to examine the anti-icing properties, the results were examined by measuring the ice adhesion forces on the surfaces with a self-designed ice adhesion device. With the synthesized hybrid coatings, the ice adhesion strength has been reduced up to 88.6% compared to the bare glass. It was concluded that the dual-layer hybrid silica aerogel coatings synthesized in this master thesis study could be promising candidates for ice-phobic/anti-icing surface design.
Icing causes various problems (security weaknesses, process stoppages, malfunctions, shortening of equipment life, economic losses, etc.) in many systems from aircraft to solar panels, wind turbines and power lines. The development of anti-icing/ice-phobic coatings is an effective method for the icing problem we encounter in many areas of our daily lives. Most of the studies carried out to date have focused on providing the ice-phobic feature due to the water repellency (hydrophobicity) of surfaces. These studies are based on the idea that surface micro-nano roughness is an effective strategy in hydrophobic surface design. Recently, however, it has been demonstrated that the roughness of superhydrophobic surfaces is insufficient to prevent ice formation under different environmental conditions. Another effective strategy is the use of slippery liquid infused porous structures. In this strategy, the desired properties are lost as the lubricant leaves the surface over time. In this study, a hybrid surface coating was designed by using these two strategies together, which are thought to be effective in ice-phobic surface design but have drawbacks. It is aimed to eliminate these disadvantages of the two strategies with the resulting synergistic effect due to the hybrid approach. For this purpose, anti-icing/ice-phobic, multifunctional aerogel coatings were synthesized by sol-gel method and coated on glass surfaces. The characterizations of the prepared coatings were carried out by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), contact angle analysis. In order to examine the anti-icing properties, the results were examined by measuring the ice adhesion forces on the surfaces with a self-designed ice adhesion device. With the synthesized hybrid coatings, the ice adhesion strength has been reduced up to 88.6% compared to the bare glass. It was concluded that the dual-layer hybrid silica aerogel coatings synthesized in this master thesis study could be promising candidates for ice-phobic/anti-icing surface design.
Açıklama
Anahtar Kelimeler
Kimya, Chemistry ; Kimya Mühendisliği
