An Approach to the Use of Glycol Alkoxysilane–Polysaccharide Hybrids in the Conservation of Historical Building Stones
| Autor: | Jorge Cervantes, Ileana Bravo-Flores, Antonio Villegas, Antonio Guerra-Contreras, Ramón Zárraga-Nuñez, Eulalia Ramírez-Oliva, Miguel Melendez-Zamudio, Merced Martínez-Rosales, Gilberto Álvarez-Guzmán |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Conservation of Natural Resources
Materials science Pharmaceutical Science 02 engineering and technology 010402 general chemistry 01 natural sciences Article Analytical Chemistry lcsh:QD241-441 Contact angle siliceous and calcareous stones chemistry.chemical_compound stone conservation lcsh:Organic chemistry Polysaccharides Drug Discovery Physical and Theoretical Chemistry Solubility Chitosan Silanes Polymer science THEOS Construction Materials Organic Chemistry 021001 nanoscience & nanotechnology Organic media Silane 0104 chemical sciences chemistry Chemistry (miscellaneous) Compatibility (mechanics) Molecular Medicine MeTHEOS 0210 nano-technology Hydrophobic and Hydrophilic Interactions |
| Zdroj: | Molecules Volume 26 Issue 4 Molecules, Vol 26, Iss 938, p 938 (2021) |
| ISSN: | 1420-3049 |
| Popis: | Stone consolidants have been widely used to protect historical monuments. Consolidants and hydrophobic formulations based on the use of tetraethoxysilane (TEOS) and alkylalkoxysilanes as precursors have been widely applied, despite their lack of solubility in water and requirement to be applied in organic media. In the search for a “greener” alternative based on silicon that has potential use in this field, the use of tetrakis(2-hydroxyethyl)silane (THEOS) and tris(2-hydroxyethyl)methyl silane (MeTHEOS) as precursors, due their high water solubility and stability, is proposed in this paper. It is already known that THEOS and MeTHEOS possess remarkable compatibility with different natural polysaccharides. The investigated approach uses the water-soluble silanes THEOS–chitosan and MeTHEOS–chitosan as a basis for obtaining hybrid consolidants and hydrophobic formulations for the conservation of siliceous and calcareous stones. In the case of calcareous systems, their incompatibility with alkoxysilanes is known and is expected to be solved by the developed hybrid consolidant. Their application in the conservation of building stones from historical and archeological sites from Guanajuato, México was studied. The evaluation of the consolidant and hydrophobic formulation treatment was mainly conducted by determining the mechanical properties and contact angle measurements with satisfactory results in terms of the performance and compatibility with the studied stones. |
| Databáze: | OpenAIRE |
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