Wettability, Photoactivity, and Antimicrobial Activity of Glazed Ceramic Tiles Coated with Titania Films Containing Tungsten
Self-cleaning coatings are advanced materials for the removal of pollutants and microorganisms by combining wettability, photocatalytic degradation, and antimicrobial activity. In this work, we propose a rational design of self-cleaning films based on TiO 2 synthesized by sol-gel on commercial glaze...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_24701343_v3_n12_p17629_Onna |
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todo:paper_24701343_v3_n12_p17629_Onna2023-10-03T16:42:24Z Wettability, Photoactivity, and Antimicrobial Activity of Glazed Ceramic Tiles Coated with Titania Films Containing Tungsten Onna, D. Fuentes, K.M. Spedalieri, C. Perullini, M. Marchi, M.C. Alvarez, F. Candal, R.J. Bilmes, S.A. Self-cleaning coatings are advanced materials for the removal of pollutants and microorganisms by combining wettability, photocatalytic degradation, and antimicrobial activity. In this work, we propose a rational design of self-cleaning films based on TiO 2 synthesized by sol-gel on commercial glazed ceramic tiles for building's indoor applications. The synthesis strategy is based on hydrolysis and condensation of Ti-isopropoxide in the presence of W(VI) precursors to tune defects and crystallinity of the resulting W-TiO 2 thin film. From the microstructure and surface composition analysis for different tungsten contents and annealing temperatures, we conclude that the film is composed by sintered TiO 2 particles with adsorbed polytungstates (WO x ) that inhibit anatase/rutile transformation. Polytungstates on TiO 2 also induce surface defects that enhance water contact angle and inactivation of Escherichia coli under visible light. The presence of W(VI) has a negligible effect toward crystal violet degradation either under visible or under UV light. These results provide evidence on the existence of at least two different types of defects: (i) intrinsic defect from a sol-gel route and (ii) induced defect by tungsten species on the surface. Understanding the correlation between composition, structure, and self-cleaning properties provides a base for an efficient design of low-cost self-cleaning ceramic tiles that can be fully manufactured in an industrial plant. © 2018 American Chemical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_24701343_v3_n12_p17629_Onna |
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Universidad de Buenos Aires |
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I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
Self-cleaning coatings are advanced materials for the removal of pollutants and microorganisms by combining wettability, photocatalytic degradation, and antimicrobial activity. In this work, we propose a rational design of self-cleaning films based on TiO 2 synthesized by sol-gel on commercial glazed ceramic tiles for building's indoor applications. The synthesis strategy is based on hydrolysis and condensation of Ti-isopropoxide in the presence of W(VI) precursors to tune defects and crystallinity of the resulting W-TiO 2 thin film. From the microstructure and surface composition analysis for different tungsten contents and annealing temperatures, we conclude that the film is composed by sintered TiO 2 particles with adsorbed polytungstates (WO x ) that inhibit anatase/rutile transformation. Polytungstates on TiO 2 also induce surface defects that enhance water contact angle and inactivation of Escherichia coli under visible light. The presence of W(VI) has a negligible effect toward crystal violet degradation either under visible or under UV light. These results provide evidence on the existence of at least two different types of defects: (i) intrinsic defect from a sol-gel route and (ii) induced defect by tungsten species on the surface. Understanding the correlation between composition, structure, and self-cleaning properties provides a base for an efficient design of low-cost self-cleaning ceramic tiles that can be fully manufactured in an industrial plant. © 2018 American Chemical Society. |
| format |
JOUR |
| author |
Onna, D. Fuentes, K.M. Spedalieri, C. Perullini, M. Marchi, M.C. Alvarez, F. Candal, R.J. Bilmes, S.A. |
| spellingShingle |
Onna, D. Fuentes, K.M. Spedalieri, C. Perullini, M. Marchi, M.C. Alvarez, F. Candal, R.J. Bilmes, S.A. Wettability, Photoactivity, and Antimicrobial Activity of Glazed Ceramic Tiles Coated with Titania Films Containing Tungsten |
| author_facet |
Onna, D. Fuentes, K.M. Spedalieri, C. Perullini, M. Marchi, M.C. Alvarez, F. Candal, R.J. Bilmes, S.A. |
| author_sort |
Onna, D. |
| title |
Wettability, Photoactivity, and Antimicrobial Activity of Glazed Ceramic Tiles Coated with Titania Films Containing Tungsten |
| title_short |
Wettability, Photoactivity, and Antimicrobial Activity of Glazed Ceramic Tiles Coated with Titania Films Containing Tungsten |
| title_full |
Wettability, Photoactivity, and Antimicrobial Activity of Glazed Ceramic Tiles Coated with Titania Films Containing Tungsten |
| title_fullStr |
Wettability, Photoactivity, and Antimicrobial Activity of Glazed Ceramic Tiles Coated with Titania Films Containing Tungsten |
| title_full_unstemmed |
Wettability, Photoactivity, and Antimicrobial Activity of Glazed Ceramic Tiles Coated with Titania Films Containing Tungsten |
| title_sort |
wettability, photoactivity, and antimicrobial activity of glazed ceramic tiles coated with titania films containing tungsten |
| url |
http://hdl.handle.net/20.500.12110/paper_24701343_v3_n12_p17629_Onna |
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