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TiO2–SiO2–PDMS nano-composite hydrophobic coating with self-cleaning properties for marble protection

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Technical University of Crete   

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TiO2–SiO2–PDMS nano-composite hydrophobic coating with self-cleaning properties for marble protection (EN)
Μαραβελακη Παγωνα (EL)
Καπριδακη Χρυση (EL)
Kapridaki Chrysi (EN)
Maravelaki Pagona (EN)
journalArticle
2013
This research work presents the design of a transparent-hydrophobic hybrid semi-crystalline SiO2–TiO2 coating and its application in the field of monument conservation. The SiO2–TiO2 coating derived from a mixture of tetraethoxysilane (TEOS) and titanium-tetra-isopropoxide (TTIP) incorporating an organosilane, the hydroxyl-terminated polydimethylsiloxane (PDMS). The complete hydrolysis of TEOS was achieved by oxalic acid, which also controlled the gel drying. XRD, DTA–TG, FT-IR and SEM analyses evaluated the designed coating, which is transparent, crack-free with a crystallite size of 5 nm. The evolution of the hydrolysis of TEOS, as well as the copolymerization of TEOS, TiO2 and PDMS as a function of time were assessed by FT-IR analysis. The effectiveness of TiO2–SiO2–PDMS nano-composite as hydrophobic coating was investigated by capillary water absorption and static contact angle measurements. The SEM analysis of the treated sample revealed a homogeneous crack-free coating on marble, while FT-IR proved that condensation and copolymerization reactions took place on the marble surface. The removal of both methylene blue stains and biofilm on treated samples support the self-cleaning properties of the designed coating. The total color differences and the decrease of the water vapor permeability range within acceptable limits. After treatment, a decrease in the water capillary coefficient and an increase in the contact angle were observed. The innovation of this synthesis pertains to the application of a hydrophobic transparent nano-composite based on SiO2–TiO2 with self-cleaning properties, without modifying the color of the marble surface and the water vapor permeability. (EN)
Monuments--Preservation,monuments conservation and restoration,monuments preservation (EN)
Progress in Organic Coatings (EL)
English
Elsevier (EN)
Πολυτεχνείο Κρήτης (EL)
Technical University of Crete (EN)
Technical University of Crete
Institutional Repository Technical University of Crete
Distributed Multimedia Information Systems and Applications Laboratory - Conference Publications
School of Electrical and Computer Engineering - Conference Publications



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