Electrokinetic Characterization of Natural Stones Coated with Nanocomposites for the Protection of Cultural Heritage

Roveri, M and Raneri, S and Bianchi, S and Gherardi, Francesca and Castelvetro, V and Toniolo, L (2018) Electrokinetic Characterization of Natural Stones Coated with Nanocomposites for the Protection of Cultural Heritage. Applied sciences, 8 (9). ISSN 2076-3417

Full content URL: https://www.mdpi.com/2076-3417/8/9/1694

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Electrokinetic Characterization of Natural Stones Coated with Nanocomposites for the Protection of Cultural Heritage
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Abstract

Protective coatings, in recent years also from nanocomposite formulations, are commonly applied onto architectural stone and stone artefacts, mainly to prevent absorption of condensed water and dissolved atmospheric pollutants into the porous stone structure. While standard protocols to assess a coating’s performance are available, understanding the response of the coating-stone system is a complex task, due to the interplay of various factors determining the overall behaviour. Characterization techniques allowing one to correlate the extent and nature of surface modification upon treatment with the most relevant physical properties (i.e., water absorption and surface wettability) are thus of great interest. Electrokinetic analysis based on streaming current measurements, thanks to its sensitivity towards even minor changes in the surface chemical composition, may fulfil such requirement. Indeed, by involving the interaction with a testing aqueous electrolyte solution, this technique allows one to probe not only the outer surface, but also the outermost layer of the pore network, which plays a crucial role in the interaction of the stone with condensed atmospheric water. In this work, a correlation was found between the extent of surface modification, as determined by streaming current measurements, surface wettability and capillary water absorption, for three lithotypes with different mineralogical and microstructural properties treated with two nanocomposite formulations (one water based and one in alcoholic solvent) containing organosilica precursors and titania nanoparticles

Additional Information: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).
Keywords:natural stones; alkylalkoxysilane; nanocomposite coatings; surface modification; zeta potential; streaming current
Subjects:F Physical Sciences > F200 Materials Science
Divisions:College of Science > School of Chemistry
ID Code:33292
Deposited On:09 Oct 2018 13:13

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