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Coatings 2018, 8(5), 170; https://doi.org/10.3390/coatings8050170

New Consolidant-Hydrophobic Treatment by Combining SiO2 Composite and Fluorinated Alkoxysilane: Application on Decayed Biocalcareous Stone from an 18th Century Cathedral

TEP-243 Nanomaterials Group, Department of Physical-Chemistry, Faculty of Sciences, Campus Río San Pedro, University of Cadiz, 11510 Puerto Real, Spain
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Received: 8 March 2018 / Revised: 30 April 2018 / Accepted: 1 May 2018 / Published: 2 May 2018
(This article belongs to the Special Issue Communications from TechnoHeritage 2017)
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Abstract

An effective procedure has been developed to consolidate and hydrophobize decayed monumental stones by a simple sol-gel process. The sol contains silica oligomer, silica nanoparticles and a surfactant, preventing gel cracking. The effectiveness of the process on biocalcareous stone samples from an 18th century cathedral has been evaluated, and it was found that the gel creates effective linking bridges between mineral grains of the stone. Silica nanoparticles produced a significant increase in the mechanical resistance and cohesion of the stone. The application of an additional fluorinated oligomer onto the consolidated stone gave rise to a surface with lasting hydrophobicity, preventing water absorption. View Full-Text
Keywords: nanocomposite; consolidant; hydrophobic agent; n-octylamine; biocalcarenite; fluorine; cathedral nanocomposite; consolidant; hydrophobic agent; n-octylamine; biocalcarenite; fluorine; cathedral
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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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Facio, D.S.; Ordoñez, J.A.; Gil, M.L.A.; Carrascosa, L.A.M.; Mosquera, M.J. New Consolidant-Hydrophobic Treatment by Combining SiO2 Composite and Fluorinated Alkoxysilane: Application on Decayed Biocalcareous Stone from an 18th Century Cathedral. Coatings 2018, 8, 170.

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