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Crystals 2016, 6(10), 136;

Stable Photocatalytic Paints Prepared from Hybrid Core-Shell Fluorinated/Acrylic/TiO2 Waterborne Dispersions

Polymat, Kimika Aplikatua Saila, Kimika Zientzien Fakultatea, University of the Basque Country UPV/EHU, Joxe Mari Korta Zentroa, Tolosa Hiribidea 72, 20018 Donostia-San Sebastián, Spain
Solvay Specialty Polymers Italy, Viale Lombardia 20, 20021 Bollate, Italy
Ecole Polytechnique Federale de Lausanne, EPFL-SB-ISIC-GPAO, Station 6, CH-105, Switzerland
Author to whom correspondence should be addressed.
Academic Editors: Roberto Comparelli, Lucia Curri and Marinella Striccoli
Received: 25 July 2016 / Revised: 13 October 2016 / Accepted: 19 October 2016 / Published: 24 October 2016
(This article belongs to the Special Issue Colloidal Nanocrystals: Synthesis, Characterization and Application)
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The contamination of air and water is one of the major concerns towards the development of a sustainable world in the 21st century. In this context many efforts are devoted to the design of photocatalytic paints able to degrade chemical and biological impurities present in air and water. In this work, the photocatalytic activity of hybrid films formed from the blends of pure acrylic or core/shell fluorinated/acrylic waterborne dispersions and photocatalytic titanium dioxide (TiO2) nanoparticle dispersions was first assessed. The films show photocatalytic activity (inactivation of the Escherichia coli bacteria under UV irradiation) at the substrate-film interface, but very reduced activity in the air-film interface due to the substantially lower amount of the TiO2 nanoparticles in the vicinity of this interface. In a second step, the fluorinated/(meth)acrylic core-shell hybrid dispersions were used as binders in the formulation of waterborne photocatalytic paints and the stability of the paints, in terms of gloss retain and color change, was assessed during 5000 hours of accelerated weathering tests (QUV-B). Although a decrease in gloss retention and increased color change occurs during the first 1000 hours of exposure, no further change of these properties takes place, which is an excellent indication of stable photocatalytic paints. View Full-Text
Keywords: photocatalytic paints; titanium dioxide nanoparticles (TiO2); accelerated weathering; film morphology; gloss and color photocatalytic paints; titanium dioxide nanoparticles (TiO2); accelerated weathering; film morphology; gloss and color

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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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Bonnefond, A.; González, E.; Asua, J.M.; Leiza, J.R.; Ieva, E.; Brinati, G.; Carella, S.; Marrani, A.; Veneroni, A.; Kiwi, J.; Pulgarin, C.; Rtimi, S. Stable Photocatalytic Paints Prepared from Hybrid Core-Shell Fluorinated/Acrylic/TiO2 Waterborne Dispersions. Crystals 2016, 6, 136.

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