Producing superhydrophobic/oleophobic coatings on Cultural Heritage building materials

Mosquera, María J.; Carrascosa, Luis A.M.; Badreldin, Nabil

doi:10.1515/pac-2017-0404

Cited by 32 publications

(29 citation statements)

References 43 publications

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“…The latter is responsible for the extreme wetting properties, which are discussed in the next paragraphs. The scenario revealed in Figure 2 for the siloxane+Ca(OH)2 coatings follows the results reported previously for the effect of SiO2 nanoparticles on the surface structure of siloxanebased composite coatings [6][7][8][9][10][11][12][13][14][15][16][17]. Surface structures reported for siloxane+SiO2 coatings on marble [6][7][8][9][10][11][12][13][14][15][16][17] are similar to those shown in Figure 2 for the siloxane+Ca(OH) 2 coatings.…”

Section: Resultssupporting

confidence: 83%

“…In these early works, silica (SiO 2 ) nanoparticles were used as additives to roughen the surface of siloxane, acrylic, and perfluorinated polymer coatings [6][7][8]. Since then, SiO 2 nanoparticles have become the standard additives for the production of superhydrophobic polymer+nanoparticle composite coatings for natural stone protection [9][10][11][12][13][14][15][16][17]. Other nanoparticles, selected for the same purpose, are aluminum oxide (Al 2 O 3 ) [8] and tin oxide (SnO 2 ) [8], as well as photo-catalytic and biocidal nanomaterials, such as titanium oxide (TiO 2 ) [8,13,[18][19][20][21], zinc oxide (ZnO) [12,19], and silver (Ag) [22].…”

Section: Introductionmentioning

confidence: 99%

“…Nanoparticles of Ca(OH) 2 are produced, characterized, mixed with a siloxane-based precursor in various concentrations, and sprayed onto marble specimens to evaluate the wettabilities of the produced composite coatings. For comparative purposes, other composite coatings were prepared using the standard SiO 2 nanoparticles that were utilized in the past to achieve extreme wetting properties [6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Superhydrophobic Coatings Based on Siloxane Resin and Calcium Hydroxide Nanoparticles for Marble Protection

2020

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Calcium hydroxide (Ca(OH2)) nanoparticles are produced following an easy, ion exchange process. The produced nanoparticles are characterized using transmission electron microscopy (TEM) and Fourier- transform infrared spectroscopy (FTIR) and are then dispersed in an aqueous emulsion of silanes/siloxanes. The dispersions are sprayed on marble and the surface structures of the deposited coatings are revealed using scanning electron microscopy (SEM). By adjusting the nanoparticle concentration, the coated marble obtains superhydrophobic and water repellent properties, as evidenced by the high static contact angles of water drops (> 150°) and the low sliding angles (< 10°). Because Ca(OH)2 is chemically compatible with limestone-like rocks, which are the most common stones found in buildings and objects of the cultural heritage, the produced composite coatings have the potential to be used for conservation purposes. For comparison, the wetting properties of another superhydrophobic and water repellent coating composed of the same siloxane material and silica (SiO2) nanoparticles, which were commonly used in several previously published reports, were investigated. The suggested siloxane+Ca(OH)2 composite coating offers good protection against water penetration by capillarity and has a small effect on the aesthetic appearance of marble, according to colorimetric measurements.

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Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Superhydrophobic Coatings Based on Siloxane Resin and Calcium Hydroxide Nanoparticles for Marble Protection

2020

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“…Figure e shows photographs of four liquids (4 µL) for d‐HSC on various substrates (i.e., water drops in blue dyed by pigment, milk drops in white, coffee drops in brown, glycerol drops in transparency deposited on copper plate (Frame 1); PVC plate (Frame 2); glass slide (Frame 3); building stone (Frame 4); sponge (Frame 5); tissue paper (Frame 6)). All of the droplets are sphere‐like, and all of the d‐HSC‐coated substrates maintained its pristine surface colors . The properties can be attributed to the special porous nanostructure morphology of the silica coating influenced by solvent polarity .…”

Section: Resultsmentioning

confidence: 96%

Multilevel Nanoparticles Coatings with Excellent Liquid Repellency

Lei

Yin

Guo

et al. 2018

Adv Materials Inter

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The excellent liquid repellency surfaces are achieved by using dual‐scale hydrophobic silica coating (d‐HSC) which nanoparticles in xylene‐based suspension without any further modification. The suspension can also be sprayed, dipped, or brushed on substrate to create a transparent superhydrophobic surface. It is demonstrated that the excellent repellency can be achieved for various liquid (e.g., water, milk, coffee, glycerol) as d‐HSC onto copper plate, polyvinyl chloride plate, glass slide, building stone, sponge, and tissue paper. Furthermore, with the addition of silane coupling agent, the d‐HSC shows resilience and maintains its performance to some extent after abrasion with sandpaper. A facile, low‐cost, and effective method to fabricate these multifunctional coatings on versatile substrates is developed without using the common method of fluoride vapor deposition for surface modification. The study is greatly significant for design of robust materials with self‐cleaning, anti‐icing, or waterproof performances that can be extended into application of many aspects (e.g., airplane wing, wall of cooling tower in industry, packing, building, etc.).

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“…The application of hydrophobic materials as protective coatings has been suggested as a potential solution for the surface protection of natural stones, used in cultural heritage [ 1 , 2 , 3 , 4 , 5 ]. More recently, advanced hybrid and composite materials of special surface structures were produced for stone protection, offering enhanced hydrophobicity and in some cases superhydrophobicity [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. The static contact angle ( θ S ) of a water drop on a hydrophobic surface is 150° < θ S < 90°, whereas on a superhydrophobic surface, θ S becomes very large, typically > 150°.…”

Section: Introductionmentioning

confidence: 99%

Waterborne Superhydrophobic and Superoleophobic Coatings for the Protection of Marble and Sandstone

2018

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Silica nanoparticles were dispersed in an aqueous emulsion of alkoxy silanes and organic fluoropolymer. The dispersion was sprayed onto white marble and sandstone. The deposited composite coatings exhibited (i) superhydrophobicity and superoleophobicity, as evidenced by the high (>150°) static contact angles of water and oil drops as well as (ii) water and oil repellency according to the low (<7°) corresponding tilt contact angles. Apart from marble and sandstone, the coatings with extreme wetting properties were deposited onto concrete, silk, and paper, thus demonstrating the versatility of the method. The siloxane/fluoropolymer product was characterized using Fourier Transform Infrared Spectroscopy (FT-IR), Raman spectroscopy and Scanning Electron Microscopy equipped with an Energy Dispersive X-ray Spectrometer (SEM-EDX). Moreover, SEM and FT-IR were used to reveal the surface structures of the composite coatings and their transition from superhydrophobicity to superhydrophilicity which occurred after severe thermal treatment. The composite coatings slightly reduced the breathability of marble and sandstone and had practically no optical effect on the colour of the two stones. Moreover, the coatings offered good protection against water penetration by capillarity.

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Producing superhydrophobic/oleophobic coatings on Cultural Heritage building materials

Cited by 32 publications

References 43 publications

Superhydrophobic Coatings Based on Siloxane Resin and Calcium Hydroxide Nanoparticles for Marble Protection

Superhydrophobic Coatings Based on Siloxane Resin and Calcium Hydroxide Nanoparticles for Marble Protection

Multilevel Nanoparticles Coatings with Excellent Liquid Repellency

Waterborne Superhydrophobic and Superoleophobic Coatings for the Protection of Marble and Sandstone

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