Self-cleaning materials on Architectural Heritage: Compatibility of photo-induced hydrophilicity of TiO2 coatings on stone surfaces

Quagliarini, Enrico; Bondioli, Federica; Goffredo, Giovanni Battista; Licciulli, Antonio; Munafò, Placido

doi:10.1016/j.culher.2012.02.006

Cited by 117 publications

(64 citation statements)

References 21 publications

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“…In agreement with Quagliarini et al [1,4], since the titania content of the aqueous suspension was 6 wt%, before application to the limestone surface, the suspension was further diluted with demineralized water in order to obtain a TiO2 content of 1 wt%. Because of the limited knowledge currently available regarding the effects nano-TiO2 may have on the environment or human health [25], a safe behavior has been adopted in the production and application steps in which there can be the risk of having the release of nanoparticles from the nanocoating surface and workers can come into contact with or inhale the released nanoparticles.…”

Section: Life Cycle Inventorysupporting

confidence: 53%

“…In particular, the inclusion of or coating with specific nanoparticles for building materials has been developed in order to obtain additional and superior properties (self-cleaning, antibacterial, anti-fogging, lightness, mechanical strength, durability, fire resistance, etc.). Among these ENPs, in the construction sector, titanium dioxide is one of the most used materials to realize self-cleaning and de-polluting coatings for cement mortars, exterior tiles, paving blocks, glasses, paints, finishing coatings, road-blocks and concrete pavements [1][2][3]. Its widespread use is attributed to its main features: high catalysis efficiency, chemical stability, inexpensiveness, compatibility with traditional construction materials and cultural heritage [4].…”

Section: Introductionmentioning

confidence: 99%

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Nano-TiO2 Coatings for Limestone: Which Sustainability for Cultural Heritage?

et al. 2015

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Abstract:The present study concerns the ecodesign of the application of an aqueous nano-TiO2 suspension on a porous limestone used in historical monuments with a spraying system through the LCA methodology, in order to define the most critical aspects of the process and to try to minimize the environmental burden during the implementation of the application process. Because of the limited knowledge currently available regarding the effects that nano-TiO2 may have on the environment or human health, a precautionary approach has been adopted in all life cycle steps, to assess the risk of having nanoparticle emissions from a nanocoating surface and for workers, who can come into contact with or inhale the nanoparticles released. The energy-intensive operations in the application stage greatly contribute to the total environmental damage, while the impact generated by nanoparticle emissions during the use phase contributes 2.9%. In addition, the self-cleaning and de-polluting transparent titania coating produces a benefit of −0.13%.

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Section: Life Cycle Inventorysupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Nano-TiO2 Coatings for Limestone: Which Sustainability for Cultural Heritage?

et al. 2015

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“…[8][9][10]) and for the consolidation of porous materials (eg. plasters, limestone or eg wall paint etc., nanodispersion of calcium hydroxide [1][2][3]).…”

Section: Article No 19 the Civil Engineering Journal 3-2017mentioning

confidence: 99%

NANOTECHNOLOGY IN THE CULTURAL HERITAGE - INFLUENCE OF NANOSPENSIONS ADOPTED BY NANOPARTICLES OF TiO2 FOR CLEANING THE SURFACE OF HISTORICAL PLASTERS

Kroftová¹,

Šmidtová²,

Kuřitka³

et al. 2017

CEJ

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The continuous development of nanostructure and the study of physico -chemical processes in the nanometer range lead to new methods that can slow down the degradation processes of a work of art, or even restore damage caused, for example, by an inappropriate restoration process. The use of nanosuspensions based on calcium hydroxide is probably the most widespread application of nanomaterials in heritage care, especially in the field of hardening of lime building materials (plaster, limestone, etc.). In combination with titanium dioxide, it should be a successful suspension in the fight against biological agents, surface contamination or in the protection of UVresistant building materials.

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“…At the same time, many research papers have investigated on the most effective and cheaper solutions to limit (or solve) this problem and some recent articles have found a good candidate in TiO 2 nano-coatings, because of their biocide power under UV irradiation, their durability and affordable costs [12][13][14][15][16][17] as well as because they have self-cleaning and depolluting effects [18][19][20][21], too. They seemed to be able to slow down algal biofouling when applied on low porous materials with smooth surfaces [22], even if algal growth is not inhibit on the substrate [13,[23][24][25] and to facilitate its removal on some substrates through the formation of a superficial water film [5].…”

Section: Introductionmentioning

confidence: 99%

On the Modelling of Algal Biofouling Growth on Nano-TiO2 Coated and Uncoated Limestones and Sandstones

Graziani

Quagliarini

2018

Coatings

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Algal biofouling on archaeological and historic materials, as well as in modern building façade, is a common phenomenon that occurs when microorganisms of various nature adhere to the material, forming biological stains and patinas. It can significantly deteriorate the aesthetic and even mechanical quality of historic and archaeological artifacts. Thus, predicting the colonization progress of algae on treated and untreated materials can be helpful to establish appropriate schedules and methods of maintenance. In this way, the aim of this research was to modelize the algal colonization on nano-TiO 2 coated and uncoated stone surfaces, usually found in historic and archaeological artifacts, by following Avrami's theory. Particular attention was paid on correlating the model with some properties of the substrate, like roughness and porosity. Biofouling was tested on two sandstones and three limestone with different intrinsic characteristics (porosity, roughness) by means of an accelerated lab-scale test. A suspension of green alga Chlorella mirabilis and cyanobacteria Chroococcidiopsis fissurarum was used as biofouling. Digital image analysis was carried out in order to find the attachment rate and the growth of algal spots. Results show that the attachment specific rate increased linearly with time, and the assumption of a constant growth rate was acceptable. A good agreement between the simulation and the experimental results was obtained with a maximum error of 0.59%.

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Self-cleaning materials on Architectural Heritage: Compatibility of photo-induced hydrophilicity of TiO2 coatings on stone surfaces

Cited by 117 publications

References 21 publications

Nano-TiO2 Coatings for Limestone: Which Sustainability for Cultural Heritage?

Nano-TiO2 Coatings for Limestone: Which Sustainability for Cultural Heritage?

NANOTECHNOLOGY IN THE CULTURAL HERITAGE - INFLUENCE OF NANOSPENSIONS ADOPTED BY NANOPARTICLES OF TiO2 FOR CLEANING THE SURFACE OF HISTORICAL PLASTERS

On the Modelling of Algal Biofouling Growth on Nano-TiO2 Coated and Uncoated Limestones and Sandstones

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