Efficiency and durability of a self-cleaning coating on concrete and stones under both natural and artificial ageing trials

Carmona-Quiroga, Paula María; Martínez-Ramírez, S.; Viles, Heather

doi:10.1016/j.apsusc.2017.10.052

Cited by 64 publications

(31 citation statements)

References 24 publications

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“…In the case of PS samples, color changes increased as the applied quantity of nanoF increased, still remaining satisfactory. In fact, all the color variations measured on PS were lower than the values perceivable by a human eye (i.e., ∆E* ab = 3 [46][47][48]).…”

Section: Determination Of the Appropriate Amount Of Nanof Productmentioning

confidence: 77%

Oleo/Hydrophobic Coatings Containing Nano-Particles for the Protection of Stone Materials Having Different Porosity

et al. 2018

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Conservation strategies to limit the degradation of stone materials are being constantly developed. To this aim, new materials are designed to confer hydrophobic properties and anti-graffiti protection to the treated surfaces. Hybrid nanocomposites, based on inorganic nano-particles added to an organic matrix, have been recently proposed for treatments of stone surfaces, obtaining promising and innovative properties. In the present paper, an experimental product based on fluorine resin containing SiO2 nano-particles, a commercial fluorine-based product and a silicon-based material were applied as protective coatings on two calcareous stones (compact and porous) widely employed in the Mediterranean region. All the studied products are expected to provide both water and anti-graffiti protection to both stones’ surfaces. The rheological characterization of the liquid products, changes in color of the surfaces, and variations in water vapor permeability allowed the compatibility of the protective systems applied to stones to be evaluated. Water–stone contact angle measurements and water absorption by capillarity were used to control the action against water ingress. The oleophobicity was assessed by measuring the oil–stone contact angle. The experimental nano-filled product proved to be a suitable hydrophobic coating for compact and porous stones; furthermore, it provides high oleophobicity to the treated surfaces, as required for anti-graffiti systems.

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Section: Determination Of the Appropriate Amount Of Nanof Productmentioning

confidence: 77%

Oleo/Hydrophobic Coatings Containing Nano-Particles for the Protection of Stone Materials Having Different Porosity

et al. 2018

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“…[2] Self-cleaning products have been set-up according to two routes considering the occurring surface wettability changes.Superhydrophilic or hydrophilic surfaces are obtained by nano-TiO 2 (nTiO 2 )d ispersions in different solvents (for example,w ater, alcohol, ethylene glycol). [5] Both synthesis routes display limitations in terms of lifespan and durability: nano-TiO 2 dispersions show poor adhesion and chemical affinity with the substrate,a st hey can be easily removed by rainfall and tend to penetrate into the pores,w ith ac onsequent dramatic decrease of their photoefficiency; [6] in nanocomposites,t he polymeric matrix can instead be compromised by the photocatalytic activity of the embedded NPs. [5] Both synthesis routes display limitations in terms of lifespan and durability: nano-TiO 2 dispersions show poor adhesion and chemical affinity with the substrate,a st hey can be easily removed by rainfall and tend to penetrate into the pores,w ith ac onsequent dramatic decrease of their photoefficiency; [6] in nanocomposites,t he polymeric matrix can instead be compromised by the photocatalytic activity of the embedded NPs.…”

Section: Thegrowingattentiontotheuseoftio 2 Nanoparticles (Nps)mentioning

confidence: 99%

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 and commercial TEOS showing photocatalytic and self-cleaning properties were set up and tested. To enhance nano-TiO efficacy, 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-TiO unaltered. The layered treatments were tested on a porous calcarenite (Noto stone) and a very compact marble (Carrara marble). The combined SiO -nano-TiO treatments can find application in suitable cases where a surface consolidation is needed, ensuring a depolluting and self-cleaning durable activity.

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“…Based on experimental evidence regarding the ability to carry out self cleaning by reaction with compounds responsible for surface finish degradation, building elements containing cement with addition of TiO2 can maintain their aesthetic appearance over time [13]. The lasting performance of photocatalytic activity was assessed [14] during one year of outdoor exposure trial and 2000 h of accelerated ageing in a chamber with UV radiation and condensation cycles. Results showed that photocatalytic activity on concrete was unaltered.…”

Section: Discussionmentioning

confidence: 99%

Self-Cleaning Concrete for Landscaping Applications

Mircea

2019

MATEC Web Conf.

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Negative effects of environmental pollution pose a significant risk to agriculture, water resources and human health. This can however be reduced by selecting appropriate materials in construction and landscape architecture. It is well-known that strong sunlight or ultraviolet light decomposes many organic materials in a slow natural process. Photocatalytic substances accelerate this process and when used in concrete (which is one of the most widely used construction materials), permit the treatment of pollutants close to their source by applying a self-cleaning principle: decomposing organic materials, biological materials and pollutants into molecules like oxygen, water, carbon dioxide, nitrates, and sulphates. Catalytic material activation will start due to energy that is received from sunlight (it also can be activated using artificial lights), and self-cleaning begins when this material is activated. Beside other properties, this innovative self-cleaning concrete also keeps its colour for far longer than other traditional building materials, making it a desirable solution for landscaping applications.

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Efficiency and durability of a self-cleaning coating on concrete and stones under both natural and artificial ageing trials

Cited by 64 publications

References 24 publications

Oleo/Hydrophobic Coatings Containing Nano-Particles for the Protection of Stone Materials Having Different Porosity

Oleo/Hydrophobic Coatings Containing Nano-Particles for the Protection of Stone Materials Having Different Porosity

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

Self-Cleaning Concrete for Landscaping Applications

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Efficiency and durability of a self-cleaning coating on concrete and stones under both natural and artificial ageing trials

Cited by 64 publications

References 24 publications

Oleo/Hydrophobic Coatings Containing Nano-Particles for the Protection of Stone Materials Having Different Porosity

Oleo/Hydrophobic Coatings Containing Nano-Particles for the Protection of Stone Materials Having Different Porosity

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

Self-Cleaning Concrete for Landscaping Applications

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Product

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