Photoactive and hydrophobic nano-ZnO/poly(alkyl siloxane) coating for the protection of sandstone

0504193 - ÚGN 2020 RIV GB eng J - Článek v odborném periodiku
Tokarský, T. - Martinec, Petr - Mamulová Kutláková, K. - Ovčaříková, H. - Študentová, S. - Ščučka, Jiří
Photoactive and hydrophobic nano-ZnO/poly(alkyl siloxane) coating for the protection of sandstone.
Construction and Building Materials. Roč. 199, February 2019 (2019), s. 549-559. ISSN 0950-0618. E-ISSN 1879-0526
Grant CEP: GA MK DG18P02OVV017
Institucionální podpora: RVO:68145535
Klíčová slova: sandstone * protection * hydrophobicity ZnO * photoactivity * poly(alkyl siloxane)
Obor OECD: Materials engineering
Impakt faktor: 4.419, rok: 2019
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S0950061818330265?via%3Dihub

Poly(alkyl siloxane) containing photoactive nano-ZnO (0.5 wt%) has been studied as a protective coating of glauconitic sandstone. Effect on visual appearance, hydrophobicity, porosity, water absorption/evaporation, and self-cleaning ability of the sandstone was measured. The results were evaluated in comparison with uncoated and poly(alkyl siloxane)-coated sandstone. Static contact angle of water reached 89 degrees +/- 3 degrees and 128 degrees +/- 2 degrees for poly(alkyl siloxane) and nano-ZnO/poly(alkyl siloxane) coating, respectively. Poly(alkyl siloxane) and nano-ZnO/poly(alkyl siloxane) coatings led to increased reduction in water absorption (>50%) for similar to 18 h and similar to 8 h, respectively, compared to the uncoated sandstone. The shorter time is compensated by self-cleaning ability: photodegradation of methylene blue on the nano-ZnO/poly(alkyl siloxane) coating after 5 h of UV irradiation was observed. This coating is a promising candidate for practical use in sandstone monuments protection.
Trvalý link: http://hdl.handle.net/11104/0295877