Performances and Coating Morphology of a Siloxane-Based Hydrophobic Product Applied in Different Concentrations on a Highly Porous Stone

Lettieri, Mariateresa; Masieri, Maurizio

doi:10.3390/coatings6040060

Cited by 24 publications

(21 citation statements)

References 42 publications

(47 reference statements)

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“…The nanoparticles increased the contact area between the stone and external environment, as compared with Figure 2d. Furthermore, the many tiny cracks improved the "breathing" of the stone; similar results have been reported in the literature [39]. Hence, TSCM has a potential advantage over p-sol and organic protective agents [21].…”

Section: Scanning Electron Microscopic Analysissupporting

confidence: 83%

“…It is important to consider the change of water vapor permeability before and after stone treatment. A coating material does not completely seal a stone surface, as blocking the ability to pass water vapor in and out of the stone may lead to the condensation of internal water, or even accelerate the deterioration of the stone [39,41]. Figure 4 shows the water vapor permeabilities of the untreated and treated sandstone samples.…”

Section: Water Vapor Permeabilitymentioning

confidence: 99%

“…water vapor in and out of the stone may lead to the condensation of internal water, or even accelerate the deterioration of the stone [39,41]. Figure 4 shows the water vapor permeabilities of the untreated and treated sandstone samples.…”

Section: Water Vapor Permeabilitymentioning

confidence: 99%

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Study of TiO2-Modified Sol Coating Material in the Protection of Stone-Built Cultural Heritage

et al. 2020

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Coating materials can effectively protect stone-built cultural heritage and, as such, research into coating materials has gained comprehensive attention from researchers. The aim of this work is to prepare a TiO 2 -modified sol coating material (TSCM) and study its protective effects on stone-built cultural heritage. TSCM and pure TiO 2 sol (p-sol, unmodified; for comparison) were applied evenly over the entire surface of stone samples. The prepared stone samples included untreated stone, stone treated with pure sol, and stone treated with TSCM. The protective effects of TSCM were evaluated by water absorption, water vapor permeability, acid resistance, and weather resistance experiments. The results show that stone treated with TSCM has excellent water absorption and water vapor permeability, strong acid resistance, and good weather resistance, compared with untreated stone or stone treated with p-sol. The acid resistance of stone treated by TSCM was 1.75 times higher than that treated with traditional coating materials. The weather resistance cycle number of stone treated by TSCM was four times higher than that treated with organic protective materials. These findings are expected to provide useful suggestions for the protection of stone-built cultural heritage.Coatings 2020, 10, 179 2 of 11 or added to acrylic polymers [22][23][24], but they could be easily removed from the coating surface owing to weak bonding [25][26][27]. In order to avoid the loss of TiO 2 nanoparticles, some researchers have proposed to composite TiO 2 nanoparticles into a SiO 2 -sol [28], which can enhance its photocatalytic activity when applied to a building. To the best of our knowledge, there have been no scientific studies about compositing TiO 2 nanoparticles into a TiO 2 -sol for the protection of stone-built cultural heritage. More importantly, the method presented in the work of [28] provides us with valuable suggestions about the protection of stone-built cultural heritage. Hence, it is necessary to investigate a modified TiO 2 -sol with significant protective effect on stone-built cultural heritage.The aim of this paper is to prepare a TiO 2 -modified sol coating material (TSCM) that is capable of protecting stone-built cultural heritage. Analyses of the composition and microscopic morphology of TSCM were conducted using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Some experiments were conducted to evaluate the protective effects of TSCM, in terms of wettability, weather resistance, and acid resistance. The results suggest that TSCM has excellent water absorption, water vapor permeability, acid resistance, and weather resistance. The study, therefore, provides a new method for the protection of stone-built cultural heritage.

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Section: Scanning Electron Microscopic Analysissupporting

confidence: 83%

Section: Water Vapor Permeabilitymentioning

confidence: 99%

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Study of TiO2-Modified Sol Coating Material in the Protection of Stone-Built Cultural Heritage

et al. 2020

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“…The water vapor transport properties of untreated stone materials were evaluated at 20 • C by the vapor transmission test described in [26]. Throughout the experiment, the containers with the samples were placed into desiccators with silica gel and stored in a climatic chamber (Mod.…”

Section: Stone Characterizationmentioning

confidence: 99%

“…Along with the absence of appreciable color variations, changes in the water vapor transport properties of coated stone materials should be avoided. Reduction in permeability may cause water condensation inside the stone, which accumulation at the interface between the treated and untreated stone regions may activate the material's decay [26].…”

Section: Water Vapor Transport Propertiesmentioning

confidence: 99%

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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The Complexation between Siloxane Species and Methylsiloxane: Electronic Structure, Thermodynamic, and Interaction Characteristics

Niu

2022

ChemistrySelect

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The interaction between organosiloxane materials and siloxane species has attracted extensive attention in the protection of cultural relics due to their bonding characteristics. In this context, detailed studies of the complexation between siloxane species and methylsiloxane were explored using various computational methods. The complex molecular structures and their electronic excitation characteristics were predicted. The strong covalent interactions of Si−O bond between siloxane and methylsiloxane are checked by topological analysis of electron density and obvious charge transfer. Thermodynamic results show that these types of complexes are considerable stability. The energy barrier of oxygen molecules to pass through the pores between methylsiloxane and silica close to 19 eV, indicating that this type of coating does not peel off easily. Moreover, IR and UV‐vis spectrum were predicted. The microscopic mechanism will give theoretical direction for theoretical guidance for practical applications of the coating in the protection of stone artifacts.

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Performances and Coating Morphology of a Siloxane-Based Hydrophobic Product Applied in Different Concentrations on a Highly Porous Stone

Cited by 24 publications

References 42 publications

Study of TiO2-Modified Sol Coating Material in the Protection of Stone-Built Cultural Heritage

Study of TiO2-Modified Sol Coating Material in the Protection of Stone-Built Cultural Heritage

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

The Complexation between Siloxane Species and Methylsiloxane: Electronic Structure, Thermodynamic, and Interaction Characteristics

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