Superhydrophobic silica antireflective coatings with high transmittance via one-step sol-gel process

Xu, Jun; Liu, Yongsheng; Du, Wenlong; Lei, Wei; Si, Xiaodong; Zhou, Tao; Lin, Jia; Lin, Peng

doi:10.1016/j.tsf.2017.03.005

Cited by 44 publications

(22 citation statements)

References 42 publications

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“…The material is known as a monolith if the dimensions of the gel are greater than scarcely millimeters [1,[162][163][164]. In case of the gelation, it takes place by quick evaporation of the solvents; the materials obtained are coatings (Figure 3), films and fibers [14,154,165]. Nevertheless, it should be kept in mind that during the loss of volatile by-products, formed through the hydrolysis and condensation reactions, controlling the sample shrinkage during the 3D network development may be challenging and puzzling [1,6,7].…”

Section: -Methacryloxypropyltrimethoxysilane Maptsmentioning

confidence: 99%

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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The corrosion process is a major source of metallic material degradation, particularly in aggressive environments, such as marine ones. Corrosion progression affects the service life of a given metallic structure, which may end in structural failure, leakage, product loss and environmental pollution linked to large financial costs. According to NACE, the annual cost of corrosion worldwide was estimated, in 2016, to be around 3%-4% of the world's gross domestic product. Therefore, the use of methodologies for corrosion mitigation are extremely important. The approaches used can be passive or active. A passive approach is preventive and may be achieved by emplacing a barrier layer, such as a coating that hinders the contact of the metallic substrate with the aggressive environment. An active approach is generally employed when the corrosion is set in. That seeks to reduce the corrosion rate when the protective barrier is already damaged and the aggressive species (i.e., corrosive agents) are in contact with the metallic substrate. In this case, this is more a remediation methodology than a preventive action, such as the use of coatings. The sol-gel synthesis process, over the past few decades, gained remarkable importance in diverse areas of application. Sol-gel allows the combination of inorganic and organic materials in a single-phase and has led to the development of organic-inorganic hybrid (OIH) coatings for several applications, including for corrosion mitigation. This manuscript succinctly reviews the fundamentals of sol-gel concepts and the parameters that influence the processing techniques. The state-of-the-art of the OIH sol-gel coatings reported in the last few years for corrosion protection, are also assessed. Lastly, a brief perspective on the limitations, standing challenges and future perspectives of the field are critically discussed.Polymers 2020, 12, 689 The development of OIH sol-gel coatings, based on siloxanes, for corrosion mitigation, has been widely studied in the last few years [2,31,[36][37][38]. Numerous studies have been conducted since the early 1990s [39,40]. The studies performed showed that siloxanes were effective in mitigating the corrosion processes of different metallic substrates. This development was mainly due to the need for alternative environmentally friend materials and processes to replace the traditional chromium-based pre-treatments. Hexavalent chromium (Cr (VI)) is carcinogenic and shows high environmental toxicity and its use has been forbidden since 2006. However, Cr(VI) based pre-treatments improve the coating adherence to the substrate and are effective corrosion inhibitors [41][42][43] which make its replacement challenging. The use of the sol-gel method to produce OIH coatings for corrosion mitigation suits the main requirements of what should be an environmentally friendly process (i.e., excludes washing stages; it is a waste-free method) and allows one to obtain coatings with high purity and specific pore volumes and surface areas. Since it is a mild synthesis...

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Section: -Methacryloxypropyltrimethoxysilane Maptsmentioning

confidence: 99%

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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“…Thin Film Calculator (TFcalc) computer software is used for theoretical simulation to [25] examine the optical properties of BSAR coating in a system methodically. This software helps in selecting the thickness and η of the individual layer in AR coating to lessen reflectance at the desired wavelength region.…”

Section: Optical Simulation For Bilayer Coating Layoutmentioning

confidence: 99%

“…[25] SiO 2 aggregated nanoparticles film on K9 148-208 nm 1.13-1.08 Sol-gel -96% transmittance at Near infra-red region (800 nm) [26] SiO 2 nanoparticle on K9 1.15-1.09 Sol-gel -97% transmittance at 600 nm [27] SiO 2 nanostructure on K9 120-130 nm 1.12-1.09 Sol-gel -97% transmittance at 500 nm [28] SiO 2 nanofilm on K9 1.23-1.33 Sol-gel 98%-99% transmittance at Near infra-red region (800 nm) [29] SiO 2 nanoparticles film on glass Sol-gel -97% transmittance at 500 nm [30] SiO 2 nanoparticles film on Fresnel lenses 125-130 nm 1.32-1. We explicate the fabrication of water-repellent highly porous SiO 2 over bulk SiO 2 matrix on a glass substrate and demonstrate the design of the suitable surface structure and Sol-gel 96%-97% transmittance at an only specified wavelength of 550 nm, sharp increment of reflectance at remaining wavelength on both sides of wave length.…”

Section: Introductionmentioning

confidence: 99%

Bilayer SiO₂ Nanorod Arrays as Omnidirectional and Thermally Stable Antireflective Coating

Khan

et al. 2018

Adv Eng Mater

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Nature instigates researchers significantly in imitating to engender comparable properties using artificial methods, which unlocks developing trend in material science and engineering progress. Fabricating graded‐index nanostructures is an effective approach to tune and generate similar properties artificially such as the moth's eye antireflectance (AR) or lotus like superhydrophobicity. Herein, Bilayer AR coatings with periodically arranged SiO2 hierarchical nanostructures resembling moth eyes are fabricated on dense SiO2 matrix base layer using the versatile route of glancing angle deposition technique (GLAD). The refractive indices of monolayer SiO2 are tuned from 1.46 to 1.08 by changing the deposition angle (α) from 0 to 88°. The fabricated bilayer SiO2 AR (BSAR) film possess high optical omnidirectional broadband transparency and tunability at a desired wavelength range showing <1% reflectance. The present AR design is flexible and practically applicable to various supporting substrate materials (η varies from 1.45 to 1.9). Furthermore, the omnidirectional BSAR films show multiple functions including enhanced mechanical strength, the thermal stability (up to 300 °C), and hydrophobic capability with a water contact angle (CA) of 147° to withstand under humid environment. This multipurpose coating provides an intriguing route in optics field for imminent research.

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“…In some semiconductor materials, the cavities result in additional features such as low thermal conductivity 6 and enhanced optical properties. [7][8][9][10] The later properties are the motivation for developing structured semiconductors, such as hollowstructured silica (SiO 2 ), for optical devices.…”

Section: Introductionmentioning

confidence: 99%

“…6,10,12 As also described by the Rayleigh-Gans approximation, the backscattering behaviour at different wavelengths is affected by the orientation of the optical axis. This is one possible explanation for the differences in the backscattering between isotropic shapes such as spheres and anisotropic shapes such as plates and disks.…”

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confidence: 99%

Hexagonal hollow silica plate particles with high transmittance under ultraviolet-visible light

et al. 2018

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Creating hollow structures is one strategy for tuning the optical properties of materials. The current study aimed to increase the optical transmittance of silica (SiO 2 ) particles. To this end, hexagonal-shaped hollow silica plate (HHSP) particles were synthesized from tetraethyl orthosilicate (TEOS) and zinc oxide (ZnO) template particles, using a microwave-assisted hydrothermal method. The size and shell thickness of the HHSP particles could be adjusted by using different TEOS/ZnO molar ratios and different ZnO template sizes, respectively. The optical transmittance of the HHSP particles depended on the shell thickness and particle size. The highest transmittance was 99% in the ultraviolet and visible region (300-800 nm) and was exhibited by HHSP particles with the thinnest shell thickness of 6.3 nm. This transmittance was higher than that exhibited by spherical hollow silica particles with a similar shell thickness. This suggested morphologydependent transmittance for the semiconducting material. These preliminary results illustrate the promising features of the HHSP particles and suggest their potential application in future transparent devices.

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Superhydrophobic silica antireflective coatings with high transmittance via one-step sol-gel process

Cited by 44 publications

References 42 publications

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Bilayer SiO₂ Nanorod Arrays as Omnidirectional and Thermally Stable Antireflective Coating

Hexagonal hollow silica plate particles with high transmittance under ultraviolet-visible light

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Superhydrophobic silica antireflective coatings with high transmittance via one-step sol-gel process

Cited by 44 publications

References 42 publications

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Bilayer SiO2 Nanorod Arrays as Omnidirectional and Thermally Stable Antireflective Coating

Hexagonal hollow silica plate particles with high transmittance under ultraviolet-visible light

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Product

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Bilayer SiO₂ Nanorod Arrays as Omnidirectional and Thermally Stable Antireflective Coating