Assessment of Stone Protective Coatings with a Novel Eco-Friendly Encapsulated Biocide
The conservation of stone monuments is a constant concern due to their continuous weathering, in which biofouling plays a relevant role. To enhance the effectiveness of biocidal treatments and to avoid environmental issues related to their possible toxicity, this research aims at formulating and cha...
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| Veröffentlicht in: | Coatings (Basel) 2021-09, Vol.11 (9), p.1109 |
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| container_title | Coatings (Basel) |
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| creator | Zuena, Martina Ruggiero, Ludovica Caneva, Giulia Bartoli, Flavia Ventura, Giancarlo Della Ricci, Maria Antonietta Sodo, Armida |
| description | The conservation of stone monuments is a constant concern due to their continuous weathering, in which biofouling plays a relevant role. To enhance the effectiveness of biocidal treatments and to avoid environmental issues related to their possible toxicity, this research aims at formulating and characterizing a coating charged with an eco-friendly biocide and showing hydrophobic properties. For this purpose, zosteric sodium salt—a natural biocide product—has been encapsulated into two silica nanocontainers and dispersed into a tetraethoxysilane-based (TEOS) coating also containing TiO2 nanoparticles. The coatings were applied on four different types of stone: brick, mortar, travertine, and Carrara marble. The effectiveness of the coating formulations and their compatibility concerning the properties of coated stones were assessed. The results showed that all coatings conferred a hydrophobic character to the substrate, as demonstrated by the increase of the static contact angle and the reduction in the capillary water absorption coefficient. The transmission of water vapor of the natural stones was preserved as well as their natural aspect. Furthermore, the coatings were homogeneously distributed on the surface and crack-free. Therefore, the protective capability of the coatings was successfully demonstrated. |
| doi_str_mv | 10.3390/coatings11091109 |
| format | Article |
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To enhance the effectiveness of biocidal treatments and to avoid environmental issues related to their possible toxicity, this research aims at formulating and characterizing a coating charged with an eco-friendly biocide and showing hydrophobic properties. For this purpose, zosteric sodium salt—a natural biocide product—has been encapsulated into two silica nanocontainers and dispersed into a tetraethoxysilane-based (TEOS) coating also containing TiO2 nanoparticles. The coatings were applied on four different types of stone: brick, mortar, travertine, and Carrara marble. The effectiveness of the coating formulations and their compatibility concerning the properties of coated stones were assessed. The results showed that all coatings conferred a hydrophobic character to the substrate, as demonstrated by the increase of the static contact angle and the reduction in the capillary water absorption coefficient. The transmission of water vapor of the natural stones was preserved as well as their natural aspect. Furthermore, the coatings were homogeneously distributed on the surface and crack-free. Therefore, the protective capability of the coatings was successfully demonstrated.</description><identifier>ISSN: 2079-6412</identifier><identifier>EISSN: 2079-6412</identifier><identifier>DOI: 10.3390/coatings11091109</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Absorptivity ; Biocides ; Biocompatibility ; Biofouling ; Contact angle ; Cultural heritage ; Encapsulation ; Hydrophobicity ; Laboratories ; Marble ; Mortars (material) ; Nanoparticles ; Natural stone ; Optical properties ; Polymerization ; Protective coatings ; Silica ; Silicon dioxide ; Sodium salts ; Stone ; Substrates ; Tetraethyl orthosilicate ; Titanium dioxide ; Toxicity ; Water absorption ; Water vapor</subject><ispartof>Coatings (Basel), 2021-09, Vol.11 (9), p.1109</ispartof><rights>2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). 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| source | MDPI - Multidisciplinary Digital Publishing Institute; Alma/SFX Local Collection; EZB Electronic Journals Library |
| subjects | Absorptivity Biocides Biocompatibility Biofouling Contact angle Cultural heritage Encapsulation Hydrophobicity Laboratories Marble Mortars (material) Nanoparticles Natural stone Optical properties Polymerization Protective coatings Silica Silicon dioxide Sodium salts Stone Substrates Tetraethyl orthosilicate Titanium dioxide Toxicity Water absorption Water vapor |
| title | Assessment of Stone Protective Coatings with a Novel Eco-Friendly Encapsulated Biocide |
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