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Fluorine Based Superhydrophobic Coatings
Anti-icing Materials International Laboratory (AMIL), Université du Québec à Chicoutimi, 555 Boulevard de l’Université, Chicoutimi, Québec G7H 2B1, Canada
Centre Universitaire de Recherche sur l’Aluminium (CURAL), Université du Québec à Chicoutimi, 555 Boulevard de l’Université, Chicoutimi, Québec G7H 2B1, Canada
* Authors to whom correspondence should be addressed.
Received: 15 February 2012; in revised form: 24 April 2012 / Accepted: 2 May 2012 / Published: 8 May 2012
Abstract: Superhydrophobic coatings, inspired by nature, are an emerging technology. These water repellent coatings can be used as solutions for corrosion, biofouling and even water and air drag reduction applications. In this work, synthesis of monodispersive silica nanoparticles of ~120 nm diameter has been realized via Stöber process and further functionalized using fluoroalkylsilane (FAS-17) molecules to incorporate the fluorinated groups with the silica nanoparticles in an ethanolic solution. The synthesized fluorinated silica nanoparticles have been spin coated on flat aluminum alloy, silicon and glass substrates. Functionalization of silica nanoparticles with fluorinated groups has been confirmed by Fourier Transform Infrared spectroscopy (FTIR) by showing the presence of C-F and Si-O-Si bonds. The water contact angles and surface roughness increase with the number of spin-coated thin films layers. The critical size of ~119 nm renders aluminum surface superhydrophobic with three layers of coating using as-prepared nanoparticle suspended solution. On the other hand, seven layers are required for a 50 vol.% diluted solution to achieve superhydrophobicity. In both the cases, water contact angles were more than 150°, contact angle hysteresis was less than 2° having a critical roughness value of ~0.700 µm. The fluorinated silica nanoparticle coated surfaces are also transparent and can be used as paint additives to obtain transparent coatings.
Keywords: sol-gel process; fluorinated silica nanoparticles; functionalization of nanoparticles; superhydrophobicity; fluoroalkylsilane; aluminum; water contact angle; FTIR; scanning electron microscopy; profilometry
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MDPI and ACS Style
Brassard, J.-D.; Sarkar, D.; Perron, J. Fluorine Based Superhydrophobic Coatings. Appl. Sci. 2012, 2, 453-464.
Brassard J-D, Sarkar D, Perron J. Fluorine Based Superhydrophobic Coatings. Applied Sciences. 2012; 2(2):453-464.
Brassard, Jean-Denis; Sarkar, D.K.; Perron, Jean. 2012. "Fluorine Based Superhydrophobic Coatings." Appl. Sci. 2, no. 2: 453-464.