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Coatings 2015, 5(2), 222-231; doi:10.3390/coatings5020222

Preservation of Historical Stone Surfaces by TiO2 Nanocoatings

Department of Civil and Building Engineering and Architecture DICEA, via Brecce Bianche 12, Ancona 60131, Italy
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Academic Editor: Enrico Quagliarini
Received: 29 April 2015 / Revised: 8 June 2015 / Accepted: 15 June 2015 / Published: 19 June 2015
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Abstract

We proposed the application of titanium dioxide (TiO2) for the preservation of historical (architectural, monumental, archaeological) stone surfaces. Solar light can activate the photocatalytic effect of TiO2 nanoparticles: heterogeneous photocatalysis is the key factor for the development of self-cleaning, depolluting and biocidal treatments able to photochemically degrade external damaging materials and prolong the durability of treated substrates, maintaining their original aspect and limiting ordinary cleaning activities. In this study, TiO2 nanoparticles dispersed in an aqueous colloidal suspension were applied directly on travertine, a light-colored limestone, by spray-coating in order to obtain a nanometric film on stone samples. To assess the feasibility of use of TiO2, we studied the characteristics of the nanocoating-stone system by monitoring the microscopic features of the coatings, the aesthetical changes induced to coated surfaces and the self-cleaning efficiency. We also monitored the self-cleaning ability over time during an accelerated ageing process to evaluate the durability of TiO2-based treatments. We confirmed both compatibility and effectiveness of TiO2 coating in the short term, anyway its efficiency decreased after artificial ageing. Further studies are necessary to better evaluate and eventually improve the stability of self-cleaning efficiency over prolonged time for outdoor stone surfaces. View Full-Text
Keywords: titanium dioxide; photocatalysis; architectural and archaeological heritage; self-cleaning coating; durability titanium dioxide; photocatalysis; architectural and archaeological heritage; self-cleaning coating; durability
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Goffredo, G.B.; Munafò, P. Preservation of Historical Stone Surfaces by TiO2 Nanocoatings. Coatings 2015, 5, 222-231.

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