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 Study on processing of self-cleaning, anti-bactericidial, stable and anti-corrosive coatings by combination of titanium dioxide and polysilazane
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Tác giả hoặc Nhóm tác giả: Nguyễn Thị Diệu Hằng, Nguyễn Đình Lâm
Nơi đăng: Journal of Catalysis and Adsorption - Tạp chí Xúc tác và Hấp phụ
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; Số: T2-No3-2013;Từ->đến trang: 49 - 56;Năm: 2013
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Trong nước
TÓM TẮT
ABSTRACT
Hybrid coatings of TiO2 on inorganic polymer matrix cured at ambient temperature have been processed successfully. Inorganic polymer used in this research is polymethylhydropolysilazane. Self-cleaning ability of the coatings was evaluated by the degradation of methylene blue (MB) by photo-catalytic reaction of TiO2. Results measuring absorption of MB solution by UV-vis spectroscopy showed that, on hybrid coating containing 60% TiO2 nano-functionalized by acetic acid, the MB conversion was 57.6% after photo-degradation during 6h. In second cycle, this coating decomposed 70.5% MB. This result demonstrates that the self-cleaning ability of hybrid coating is high and stable. The anti-corrosion of coatings was assessed by measurement of Tafel polarization curves. The antibacterial activity was tested with E. Coli bacteria. The adhesion of coating was examined by cutting method according to TCVN 2097-1993. The thermal stability was evaluated by thermogravimetric analysis in nitrogen environment. The obtained results of this study showed that hybrid coatings containing 50 ÷ 60% TiO2 nano-functionalized have high antibacterial activity, high corrosion resistance, good adhesion and good thermal stability. These coatings are well suitable for the protection of marine oil and gas industrial constructions.
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