Abstract
A self-cleaning coating based on TiO2 nanoparticles obtained by sol–gel method in an alkaline environment has been tested on different types of carbonatic stones: Botticino, Carrara and Pietra Dorata, frequently used in historic buildings. XRD and Raman measurements confirmed the nanocrystalline nature of titania in anatase form, with 5–10 nm crystal size, and evidenced a small amount of brookite. A fast photocatalytic oxidation by TiO2 coatings of the stained stones with methyl orange and methylene blue under UV lamp irradiation has been assessed. The enhancement of surface wettability due to UV-induced TiO2 hydrophilicity has been evidenced by contact angle measurements. ESEM/EDS showed a surface distribution of the coating fairly homogeneous. The coating does not introduce significant colorimetric changes of the stones and does not alter the water capillarity absorption. Thus, the alkaline nanocrystalline TiO2 is promising for self-cleaning coatings on carbonatic stones.
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Support from MAECI (project “NANO4HER, Nanotechnology at the service of cultural heritage preservation”, Italy-Israel Scientific and Technological Cooperation) is gratefully acknowledged.
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Bergamonti, L., Bondioli, F., Alfieri, I. et al. Photocatalytic self-cleaning TiO2 coatings on carbonatic stones. Appl. Phys. A 122, 124 (2016). https://doi.org/10.1007/s00339-015-9560-y
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DOI: https://doi.org/10.1007/s00339-015-9560-y