Sol-gel synthesis of xTiO2(100 −x)SiO2 nanocomposite thin films: Structure, optical and antireflection properties

Kermadi, S.; Agoudjil, N.; Sali, S.; Boumaour, M.; Bourgeois, S.; Lucas, M.C. Marco de

doi:10.1016/j.tsf.2014.05.068

Cited by 26 publications

(11 citation statements)

References 56 publications

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“…The silica coating was prepared by classical sol-gel synthesis starting from the alkoxide precursor (TEOS), as reported by Kermadi et al [21]. The commercial perfluoropolyether (named Fluorolink®S10, provided by Solvay Specialty Polymers) was mixed with TEOS, maintaining a weight ratio of 80/20 respectively, before the initiation of the hydrolysis and condensation reaction.…”

Section: Coatings Synthesis and Preparationmentioning

confidence: 99%

Use of a sol-gel hybrid coating composed by a fluoropolymer and silica for the mitigation of mineral fouling in heat exchangers

Oldani

Sergi

Pirola

et al. 2016

Applied Thermal Engineering

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The technology of the organic/inorganic hybrid coating was employed in the preparation of a hydrophobic coating (contact angle higher than 140°) for fouling mitigation on stainless steel heat transfer surfaces. A commercial triethoxysilane perfluoropolyethers was combined with a sol-gel silica network with the aim to increase the mechanical and thermal resistance of the films when exposed to aggressive liquid environments as the heat exchanging fluids. The experimentation on a shell and tube heat exchanger pilot plant confirmed the ability of the hybrid coating to prolong the crystallization fouling induction period of 200 h in respect to an uncoated heat exchanger, operating in the same conditions. Moreover, the fouling particles deposited on the coated heat transfer surfaces had only slight adhesion strength toward the coated surfaces and were easily removed by inducing higher wall shear stresses inside the tubes of the plant.

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Section: Coatings Synthesis and Preparationmentioning

confidence: 99%

Use of a sol-gel hybrid coating composed by a fluoropolymer and silica for the mitigation of mineral fouling in heat exchangers

Oldani

Sergi

Pirola

et al. 2016

Applied Thermal Engineering

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“…Si 40 Ti 60 composite bands, at 396, and 639 cm-1, suggests anatase and rutile peaks combination (Figure 2-B). Si 86 Ti 14 composite films did not show anatase/rutile peaks (Figure 2-B), probably, due to high Si/Ti molar rate [17]. Preliminar photocalyst test, not reported in this paper, suggest that both composite samples exhibited photocalytic Figure 2 Raman spectra of pure TiO 2 and TiO 2 /SiO 2 composite films heat-treated at different temperatures.…”

Section: Resultsmentioning

confidence: 71%

Superhydrophilic self-cleaning surfaces based on TiO2 and TiO2/SiO2 composite films for photovoltaic module cover glass

et al. 2015

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Self-cleaning surfaces have excelled in recent years in energy and environmental fields. In particular, in solar energy area, these surfaces are used to avoid soiling accumulation on photovoltaic (PV) modules. So far TiO 2 has been widely used due to its photocatalytic activity and photo-induced superhydrophilicity. However, this oxide has some limitations since it reduces the glass transmittance and it rapidly reestablish the water contact angle in dark environments. In order to circumvent these limitations, composites TiO 2 /SiO 2 have been proposed. For photovoltaic application, besides a good transparency in the wavelength region 300-1800 nm and self-cleaning properties, the coating should also present long durability and adequate adhesion to endure the outdoor conditions. Aiming at developing a coating with these properties, in this work, TiO 2 /SiO 2 composites containing different titanium content have been synthesized and compared with pure TiO 2 films in relation to adhesion, transparency and hydrophilicity. Both films have been deposited over low iron float glass substrates by sol-gel dipcoating technique and different calcination temperatures (400, 500, 600°C) and Si/Ti molar rates (Si 86 Ti 14 , Si 40 Ti 60 ) have been considered. TiO 2 /SiO 2 films showed higher transmittance in visible range compared with pure TiO 2 . TiO 2 /SiO 2 films showed superhydrophilic character before and after ultraviolet irradiation, with water contact angles near to 0°. Furthermore, as predicted, TiO 2 /SiO 2 films could keep the superhydrophilic character in dark environments, in contrast with pure TiO 2 films. Both TiO 2 and TiO 2 /SiO 2 films exhibited good adherence and it is shown that higher calcination temperatures and higher titanium content enhance such property. All films presented abrasion resistant property in contact with sponge and detergent. It has been demonstrated that high transmittance, self-cleaning and adherent composite has been obtained by a simple sol-gel route presenting good potential to be applied on photovoltaics systems.

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“…Strong bands at 1102 cm −1 maybe ascribed to an overlap of asymmetric stretching of Si–O–Si (Nilchi et al, ; Zou and Gao, ) and the presence of hydroxyl group in Ti‐OH (Bezrodna et al, ). Besides, the band located at about 944 cm −1 indicated the formation of Ti–O–Si bond in the TiO 2 –SiO 2 (Zhang et al, ).The peak around 613 cm −1 which disappeared in Figure b was associated to Si‐Si vibrations of the silicon substrate(Kermadi et al, ).…”

Section: Resultsmentioning

confidence: 95%

In situ synthesis and hydrothermal crystallization of nanoanatase TiO₂–SiO₂ coating on aramid fabric (HTiSiAF) for UV protection

Deng

Zhang

2015

Microscopy Res & Technique

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TiO2 -SiO2 thin film was prepared by sol-gel method and coated on the aramid fabric to prepare functional textiles. The aramid fabric was dipped and withdrawn in TiO2 -SiO2 gel and hydrothermal crystallization at 80(°) C, then its UV protection functionality was evaluated. The crystalline phase and the surface morphology of TiO2 -SiO2 thin film were characterized using SEM, XRD, and AFM respectively. SEM showed hydrothermal crystallization led to a homogeneous dispersion of anatase nonocrystal in TiO2 -SiO2 film, and XRD suggested the mean particle size of the formed anatase TiO2 was less than 30 nm. AFM indicated that hydrothermal treatment enhanced the crystallization of TiO2 . UV protection analysis suggested that the hydrothermally treated coated textile had a better screening property in comparison with TiO2 -SiO2 gel and native aramid fabric.

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Sol-gel synthesis of xTiO2(100 −x)SiO2 nanocomposite thin films: Structure, optical and antireflection properties

Cited by 26 publications

References 56 publications

Use of a sol-gel hybrid coating composed by a fluoropolymer and silica for the mitigation of mineral fouling in heat exchangers

Use of a sol-gel hybrid coating composed by a fluoropolymer and silica for the mitigation of mineral fouling in heat exchangers

Superhydrophilic self-cleaning surfaces based on TiO2 and TiO2/SiO2 composite films for photovoltaic module cover glass

In situ synthesis and hydrothermal crystallization of nanoanatase TiO₂–SiO₂ coating on aramid fabric (HTiSiAF) for UV protection

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Sol-gel synthesis of xTiO2(100 −x)SiO2 nanocomposite thin films: Structure, optical and antireflection properties

Cited by 26 publications

References 56 publications

Use of a sol-gel hybrid coating composed by a fluoropolymer and silica for the mitigation of mineral fouling in heat exchangers

Use of a sol-gel hybrid coating composed by a fluoropolymer and silica for the mitigation of mineral fouling in heat exchangers

Superhydrophilic self-cleaning surfaces based on TiO2 and TiO2/SiO2 composite films for photovoltaic module cover glass

In situ synthesis and hydrothermal crystallization of nanoanatase TiO2–SiO2 coating on aramid fabric (HTiSiAF) for UV protection

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In situ synthesis and hydrothermal crystallization of nanoanatase TiO₂–SiO₂ coating on aramid fabric (HTiSiAF) for UV protection