A new preventive coating for building stones mixing a water repellent and an eco-friendly biocide

Eyssautier‐Chuine, Stéphanie; Calandra, Ivan; Vaillant‐Gaveau, Nathalie; Fronteau, Gilles; Thomachot-Schneider, Céline; Hubert, Julien; Pleck, Jessica; Gommeaux, Maxime

doi:10.1016/j.porgcoat.2018.03.022

Cited by 34 publications

(19 citation statements)

References 52 publications

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“…A more pronounced decrease was measured in the PS samples, where the highest amount of SW was applied. Although these results are close to those reported in the literature for many siloxane-based coatings applied to stone materials [51][52][53], the permeability decrease, i.e., RVP, exceeded the acceptable threshold of 20% [54]. Table 5.…”

Section: Water Vapor Transport Propertiessupporting

confidence: 87%

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: Water Vapor Transport Propertiessupporting

confidence: 87%

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

et al. 2018

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“…Recent studies showed that the mesoporous silica can release biocides “on-demand” (Böttcher et al, 1999 ; Chan et al, 2017 ; Ruggiero et al, 2018 ). In this regard, the long-term actions of MSNs on paper (Michaelsen et al, 2013 ), woods (Liu et al, 2001 ), and stones (Allsopp et al, 2004 ; Eyssautier-Chuine et al, 2018 ) have been already assessed.…”

Section: Introductionmentioning

confidence: 99%

Formulation of Mesoporous Silica Nanoparticles for Controlled Release of Antimicrobials for Stone Preventive Conservation

et al. 2020

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The biotic deterioration of artifacts of archaeological and artistic interest mostly relies on the action of microorganisms capable of thriving under the most disparate environmental conditions. Thus, to attenuate biodeterioration phenomena, biocides can be used by the restorers to prevent or slow down the microbial growth. However, several factors such as biocide half-life, its wash-out because of environmental conditions, and its limited time of action make necessary its application repeatedly, leading to negative economic implications. Sound and successful treatments are represented by controlled release systems (CRSs) based on porous materials. Here, we report on the design and development of a CRS system based on mesoporous silica nanoparticles (MSNs), as a carrier, and loaded with a biocide. MSNs, with a diameter of 55 nm and cylindrical pores of ca. 3-8 nm arranged as parallel arrays concerning the NP diameter, and with 422 m 2 /g of specific surface area were synthesized by the sol-gel method assisted by oil in water emulsion. Biocide loading and release were carried out in water and monitored by UV-Vis Spectroscopy; in addition, microbiological assay was performed using as control the MCM-41 mesoporous silica loaded with the same biocide. The role of specific supramolecular interaction in regulating the release is discussed. Further, we demonstrated that this innovative formulation was useful in inhibiting the in vitro growth of Kocuria rhizophila, an environmental Gram-positive bacterial strain. Besides, the CRS here prepared reduced the bacterial biomass contaminating a real case study (i.e., stone derived from the Santa Margherita cave located in Sicily, Italy), after several months of treatment thus opening for innovative treatments of deteriorated stone artifacts.

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“…Over the past decades, the achievement of surface hydrophobicity has been one of the main challenging issues to deal with by the contemporary scientists [1][2][3][4]. In particular, it is widely reported that hydrophobic surfaces can be obtained by both their modification using low-surface-energy coatings and by increasing the relative surface area (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The main cause is the presence of water, due to rain and humidity, which vehiculates salts and bacteria inside the stones, thus provoking either their break or the molds growth. In order to block these degradative processes, a highly hydrophobic protective coating must be applied on the surface of the stone [2,12].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, a fundamental requirement of any kind of hydrophobic polymer for stone protection is the chemical stability under ambient exposure. Eyssautier-Chuine et al [2] studied the development of an eco-friendly coating with both hydrophobic and biocide properties, based on a silane/siloxane emulsion as a water repellent. The artificial ageing test revealed a moderate color variation on coated stones and, notwithstanding the simulation of rainfall caused the enlargement of pores and eroded the films in patches, the hydrophobic effect was preserved.…”

Section: Introductionmentioning

confidence: 99%

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The hydrophobicity modulation of glass and marble materials by different Si-based coatings

Pargoletti

Motta

Comite

et al. 2019

Progress in Organic Coatings

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Hydrophobic polymers applied on hydroxylated surfaces increase their durability against undesired weathering processes. The achievement of a certain degree of surface hydrophobicity (reducing the water permeation) constitutes one of the main research focuses. Herein, two commercial Si-based resins (e.g. Alpha®SI30 and Blue-sil®BP9710), directly applied on both glass and Carrara marble substrates, and a silanization process by using trichloromethylsilane (TCMS) were adopted. Contact angle measurements together with hysteresis determination and Surface Free Energy (SFE) were carried out to evaluate the hydrophobic features. Hence, since only in the case of TCMS a good hydrophobicity was achieved (θ around 150°), two commercial polysiloxane-based additives (e.g. TegoPhobe 1500 N and TegoPhobe 1650) were added respectively to Alpha®SI30 and Bluesil®BP9710, according to their chemical compatibility. These auxiliary substances allowed to decrease the wettability features of either glass or marble. Furthermore, since all the investigated coatings could be used as stone materials protective agents, water capillary absorption and vapor permeability tests were performed. Also in this case, TCMS revealed to be the most performing one among the adopted silane-based resins, thanks to the drastic reduction of absorbed water and the decrease of vapor permeability within the threshold value of 50%. Finally, the coatings stability was evaluated by accelerated ageing tests.

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A new preventive coating for building stones mixing a water repellent and an eco-friendly biocide

Cited by 34 publications

References 52 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

Formulation of Mesoporous Silica Nanoparticles for Controlled Release of Antimicrobials for Stone Preventive Conservation

The hydrophobicity modulation of glass and marble materials by different Si-based coatings

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