Layered treatments of natural stones based on dispersions of experimental nano-TiO2and commercial TEOS showing photocatalytic and self-cleaning properties were set up and tested. To enhance nano-TiO2efficacy, a surface pre-treatment with tetraethyl orthosilicate was proposed to avoid the penetration of NPs into the crystalline porous substrates and to improve their adhesion to the stone. Two treatment applications (wet-on-wet and wet-on-dry) were compared, showing different results. A strong interaction Si-O-Ti was the key factor for the successful treatment, leaving the band gap and relevant properties of nano-TiO2unaltered. The layered treatments were tested on a porous calcarenite (Noto stone) and a very compact marble (Carrara marble). The combined SiO2-nano-TiO2treatments can find application in suitable cases where a surface consolidation is needed, ensuring a depolluting and self-cleaning durable activity.

Layered Nano-TiO2Based Treatments for the Maintenance of Natural Stones in Historical Architecture

Gherardi, Francesca;Goidanich, Sara;Toniolo, Lucia
2018

Abstract

Layered treatments of natural stones based on dispersions of experimental nano-TiO2and commercial TEOS showing photocatalytic and self-cleaning properties were set up and tested. To enhance nano-TiO2efficacy, a surface pre-treatment with tetraethyl orthosilicate was proposed to avoid the penetration of NPs into the crystalline porous substrates and to improve their adhesion to the stone. Two treatment applications (wet-on-wet and wet-on-dry) were compared, showing different results. A strong interaction Si-O-Ti was the key factor for the successful treatment, leaving the band gap and relevant properties of nano-TiO2unaltered. The layered treatments were tested on a porous calcarenite (Noto stone) and a very compact marble (Carrara marble). The combined SiO2-nano-TiO2treatments can find application in suitable cases where a surface consolidation is needed, ensuring a depolluting and self-cleaning durable activity.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/1063548
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