Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Synthesis and characterization of photocatalytic hydrophobic hybrid TiO2-SiO2 coatings for building applications
https://orcid.org/0000-0001-5283-9236
https://orcid.org/0000-0002-2246-2981
AbstractBuilding materials undergo degradation caused by pollutant agents. Different solutions are proposed for the preservation of building façades: one of them is to modify their surface in order to confer self-cleaning properties, that are obtained by superhydrophobic treatments or by use of photo-catalytic materials. This work describes the synthesis of three different TiO2 and SiO2 hybrid sols and their deposition as coatings on ordinary solid gray bricks used for building construction. The dried sols were characterized by TEM (STEM-EDX), Raman and XRD analyses, confirming their anatase nanocrystalline structure with a little amount of brookite. The coated surfaces of the bricks have been characterized by functional tests and show both hydrophobic and photocatalytic properties. Before irradiation all coatings display high water contact angle (WCA) > 145° and Methylene Blue (MB) stains were photodegraded in a few hours under the irradiation of a solar lamp. The contact angles are reduced by long irradiation times but the hydrophobic properties are recovered keeping the samples in the dark.
HighlightsHybrid TiO2–SiO2 water based sols were synthesized and deposited on bricks.The nanocrystalline structure has been assessed.Coexisting hydrophobic and photocatalytic properties were demonstrated.A practical and efficient way for the preservation of buildings is proposed.
Synthesis and characterization of photocatalytic hydrophobic hybrid TiO2-SiO2 coatings for building applications
https://orcid.org/0000-0001-5283-9236
https://orcid.org/0000-0002-2246-2981
AbstractBuilding materials undergo degradation caused by pollutant agents. Different solutions are proposed for the preservation of building façades: one of them is to modify their surface in order to confer self-cleaning properties, that are obtained by superhydrophobic treatments or by use of photo-catalytic materials. This work describes the synthesis of three different TiO2 and SiO2 hybrid sols and their deposition as coatings on ordinary solid gray bricks used for building construction. The dried sols were characterized by TEM (STEM-EDX), Raman and XRD analyses, confirming their anatase nanocrystalline structure with a little amount of brookite. The coated surfaces of the bricks have been characterized by functional tests and show both hydrophobic and photocatalytic properties. Before irradiation all coatings display high water contact angle (WCA) > 145° and Methylene Blue (MB) stains were photodegraded in a few hours under the irradiation of a solar lamp. The contact angles are reduced by long irradiation times but the hydrophobic properties are recovered keeping the samples in the dark.
HighlightsHybrid TiO2–SiO2 water based sols were synthesized and deposited on bricks.The nanocrystalline structure has been assessed.Coexisting hydrophobic and photocatalytic properties were demonstrated.A practical and efficient way for the preservation of buildings is proposed.
Synthesis and characterization of photocatalytic hydrophobic hybrid TiO2-SiO2 coatings for building applications
https://orcid.org/0000-0001-5283-9236
https://orcid.org/0000-0002-2246-2981
AbstractBuilding materials undergo degradation caused by pollutant agents. Different solutions are proposed for the preservation of building façades: one of them is to modify their surface in order to confer self-cleaning properties, that are obtained by superhydrophobic treatments or by use of photo-catalytic materials. This work describes the synthesis of three different TiO2 and SiO2 hybrid sols and their deposition as coatings on ordinary solid gray bricks used for building construction. The dried sols were characterized by TEM (STEM-EDX), Raman and XRD analyses, confirming their anatase nanocrystalline structure with a little amount of brookite. The coated surfaces of the bricks have been characterized by functional tests and show both hydrophobic and photocatalytic properties. Before irradiation all coatings display high water contact angle (WCA) > 145° and Methylene Blue (MB) stains were photodegraded in a few hours under the irradiation of a solar lamp. The contact angles are reduced by long irradiation times but the hydrophobic properties are recovered keeping the samples in the dark.
HighlightsHybrid TiO2–SiO2 water based sols were synthesized and deposited on bricks.The nanocrystalline structure has been assessed.Coexisting hydrophobic and photocatalytic properties were demonstrated.A practical and efficient way for the preservation of buildings is proposed.
Synthesis and characterization of photocatalytic hydrophobic hybrid TiO2-SiO2 coatings for building applications
Alfieri, Ilaria (Autor:in) / Lorenzi, Andrea (Autor:in) / Ranzenigo, Luca (Autor:in) / Lazzarini, Laura (Autor:in) / Predieri, Giovanni (Autor:in) / Lottici, Pier Paolo (Autor:in)
Building and Environment ; 111 ; 72-79
26.10.2016
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Online Contents | 2017
Hydrophobic and Oleophobic Coatings
| Springer Verlag | 2004