Efficient self-cleaning treatments for built heritage based on highly photo-active and well-dispersible TiO2 nanocrystals

Gherardi, Francesca; Colombo, A; D’Arienzo, Massimiliano; Credico, Barbara Di; Goidanich, Sara; Morazzoni, Franca; Simonutti, Roberto; Toniolo, Lucia

doi:10.1016/j.microc.2015.11.043

Cited by 60 publications

(43 citation statements)

References 42 publications

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“…Transparent water dispersions of pure anatase TiO 2 nanoparticles (3% by weight, nanoparticles size around 40 nm), synthesized according to the non-aqueous route [32], as reported in previous papers [28,33], were used to set-up the innovative treatments. Nanoparticles showed high stability once dispersed in water and no aggregation occurs.…”

Section: Application Of the Treatments On The Marble Surfacesmentioning

confidence: 99%

“…The treatments include: The treatments were applied by brush on the clean and dried stone surface in order to cover it entirely with a single layer [28,30]. The amount of applied products determined by weight before and after the application (mg/cm 2 ) is reported in Table 1.…”

Section: Application Of the Treatments On The Marble Surfacesmentioning

confidence: 99%

“…These treatments have been recently developed and provided promising results in laboratory [28][29][30]. The study is particularly focused on the evaluation of the effect of the introduction of innovative titania nanoparticles in selected commercial products for the protection of marble stone surfaces.…”

Section: Introductionmentioning

confidence: 99%

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On-site monitoring of the performance of innovative treatments for marble conservation in architectural heritage

et al. 2017

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Innovative nanostructured treatments for stone conservation, based on dispersions of photoactive TiO 2 nanoparticles, recently studied in our research group, provided interesting results after laboratory testing. Unfortunately, it is almost impossible to accurately reproduce in the lab the complexity of field exposure conditions. It is then of crucial importance to evaluate the behaviour and durability of new treatments in situ, once they are applied to real deteriorated surfaces of the architectural heritage exposed in outdoor. In the present research, the effectiveness of a TEOS-nanoTiO 2 treatment and of two nanocomposites based on nano-TiO 2 dispersion in organosiloxane and functionalized SiO 2 for the protection of two specific marbles-Candoglia and Crevoladossola-has been evaluated on-site. The effect of the introduction of innovative titania nanoparticles in selected commercial products has been examined focusing on compatibility and protection efficacy in real exposure condition. An on-site testing protocol has been defined and carried out for 12 months after the application, considering colour and morphology changes and water absorption by capillarity. The nano-TiO 2 addition does not hinder the performance of the protective treatments while it provides a positive contribution in soiling reduction. The results will be implemented in the operative framework of the ongoing conservation project of the considered historical façade.

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Section: Application Of the Treatments On The Marble Surfacesmentioning

confidence: 99%

Section: Application Of the Treatments On The Marble Surfacesmentioning

confidence: 99%

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On-site monitoring of the performance of innovative treatments for marble conservation in architectural heritage

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“…Hence, it is necessary to find a solution to handle such problems. Various strategies have been used to modify these materials in order to assist human's work, one of which is through the surface engineering technology [4].…”

Section: Introductionmentioning

confidence: 99%

“…Moon (2013), [13] sol-gel method is commonly used in the synthesis of thin film or modification of pore since its multilayer deposition can control the structure, composition, and activity of the thin film's result. F. Gherardi (2016) [4] synthesized TiO 2 films by using a TTIP precursor added by HCl and ethyl alcohol and stirred with a magnetic stirrer for 1 hour. After that, the coating on glass substrates was donevia spin coating method.…”

Section: Introductionmentioning

confidence: 99%

The effect of TiO₂thin film thickness on self-cleaning glass properties

Mufti

Laila

Hartatiek

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. TiO 2 is one of semiconductor materials which are widely used as photocatalyst in the form of a thin film. The TiO 2 thin film is prepared by using the spin coating sol-gel method. The researcher prepared TiO 2 thin film with 3 coating variations and X-Ray Diffraction characterization, UV-Vis Spectrophotometer, Electron Microscopy Scanning, and examined its hydrophilic and anti-fogging properties. The result of X-Ray Diffraction showed that the phase formed is the anatase on 101crystal field. The Electron Microscopy Scanning images showed that TiO 2 thin films had a homogeneous surface with the particle sizes as big as 235 nm, 179 nm, and 137 nm. The thickness of each thin film was 2.06 m  , 3.33 m  , and 5.20 m  . The characterization of UV-Vis Spectrophotometer showed that the greatest absorption to the wavelength of visible light was in the thin film's thickness of 3 coatings with the band-gap determined by using 3.30 eV, 3.33 eV, and 3.33 eV Plot Tuoc. These results indicated that the rate of absorption would be increased by increasing the thickness of film. The increasing thickness of the thin film makes the film hydrophilic able to be used as an anti-fogging substance.

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Layered Nano‐TiO₂ Based Treatments for the Maintenance of Natural Stones in Historical Architecture

et al. 2018

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Layered treatments of natural stones based on dispersions of experimental nano-TiO 2 and commercial TEOS showing photocatalytic and self-cleaning properties were set up and tested. To enhance nano-TiO 2 efficacy,asurface pretreatment with tetraethyl orthosilicate was proposed to avoid the penetration of NPs into the crystalline porous substrates and to improve their adhesion to the stone.T wo treatment applications (wet-on-wet and wet-on-dry) were compared, showing different results.Astrong interaction SiÀOÀTi was the key factor for the successful treatment, leaving the band gap and relevant properties of nano-TiO 2 unaltered. The layered treatments were tested on ap orous calcarenite (Noto stone) and av ery compact marble (Carrara marble). The combined SiO 2 -nano-TiO 2 treatments can find application in suitable cases where as urface consolidation is needed, ensuring adepolluting and self-cleaning durable activity.

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Efficient self-cleaning treatments for built heritage based on highly photo-active and well-dispersible TiO2 nanocrystals

Cited by 60 publications

References 42 publications

On-site monitoring of the performance of innovative treatments for marble conservation in architectural heritage

On-site monitoring of the performance of innovative treatments for marble conservation in architectural heritage

The effect of TiO₂thin film thickness on self-cleaning glass properties

Layered Nano‐TiO₂ Based Treatments for the Maintenance of Natural Stones in Historical Architecture

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Efficient self-cleaning treatments for built heritage based on highly photo-active and well-dispersible TiO2 nanocrystals

Cited by 60 publications

References 42 publications

On-site monitoring of the performance of innovative treatments for marble conservation in architectural heritage

On-site monitoring of the performance of innovative treatments for marble conservation in architectural heritage

The effect of TiO2thin film thickness on self-cleaning glass properties

Layered Nano‐TiO2 Based Treatments for the Maintenance of Natural Stones in Historical Architecture

Contact Info

Product

Resources

About

The effect of TiO₂thin film thickness on self-cleaning glass properties

Layered Nano‐TiO₂ Based Treatments for the Maintenance of Natural Stones in Historical Architecture