CuO/SiO2 nanocomposites: A multifunctional coating for application on building stone
| Autor: | Jesús M. Cantoral, María Carbú, M.L. Almoraima Gil, Maria J. Mosquera, Rafael Zarzuela |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Biocide
Nanocomposite Materials science Precipitation (chemistry) Mechanical Engineering Nucleation Nanotechnology 02 engineering and technology Bacterial growth engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Biofouling Coating Mechanics of Materials engineering lcsh:TA401-492 General Materials Science lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology |
| Zdroj: | Materials & Design, Vol 114, Iss, Pp 364-372 (2017) |
| ISSN: | 0264-1275 |
| Popis: | The decay of building materials is generally caused by the combination of chemical, physical and biological agents. Therefore, the development of products that combine multiple protection mechanisms is desirable. We have developed, via a sol-gel route, CuO/SiO2 nanocomposites with application as a multifunctional protective treatment for building stones. In this work, we demonstrate that CuONPs act as a catalyst of the sol-gel process and promote the formation of nucleation centers, affecting the final structure of the nanocomposites. We also conclude that the nanocomposites increase mechanical resistance and decrease microbial growth of two reference laboratory microorganisms (bacteria and yeast) on a typical building limestone. Moreover, the release of Cu2+ ions is the most likely mechanism for the biocidal effect. Finally, we find that the highest concentration of CuONPs, in the studied range (0.00–0.35% w/v), was not the most effective because it causes a NPs precipitation, decreasing the biocidal effect, and the resulting material is heterogeneous and fragile. An intermediate proportion of CuONPs provides a suitable consolidant and biocide performance. Keywords: Biocide, Biofouling, Building stone, Copper oxide, Silica nanocomposite, Consolidant |
| Databáze: | OpenAIRE |
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