Preparation of Antireflective Silica Coating by the Sol-Gel Method for Heliothermic Power Plants

Silva, Débora Guimarães da; Costa, Vilma C.; Nunes, Rogério Antônio Xavier

doi:10.1590/1980-5373-mr-2017-0970

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…The sol-gel route can be used for production of the separation layer, since it has been proven as an efficient method for production of high-quality silica membranes 22,23 . It allows precise control of the pore structure (shape and pore size distribution) 24,25,26 , a desired characteristic for membrane production. In addition, it is a suitable route for thin film deposition, due to the capability to coat materials of various shapes and areas, as well as demanding low temperatures and simple equipment 22,24,27 .…”

Section: Separation Methodsmentioning

confidence: 99%

“…It allows precise control of the pore structure (shape and pore size distribution) 24,25,26 , a desired characteristic for membrane production. In addition, it is a suitable route for thin film deposition, due to the capability to coat materials of various shapes and areas, as well as demanding low temperatures and simple equipment 22,24,27 . For production of microporous Figure 1.…”

Section: Separation Methodsmentioning

confidence: 99%

“…silica layer, acidic synthesis conditions and short aging times are preferred before deposition 25 . The use of dipcoating for production of sol-gel derived silica coatings has shown its capability to produce homogeneous layer 24,28 . According to the Landau-Levich equation 28 , the dip coating method allows control of the film thickness by adjusting the withdrawal speed 29 .…”

Section: Separation Methodsmentioning

confidence: 99%

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Production and Characterization of a Silica-Alumina Membrane Using Novel Tubular Freeze-Cast Substrates

et al. 2019

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Development of new ceramic membranes has recently grown due to its superior thermal and mechanical stability. An interesting approach to manufacture asymmetric membranes is the production of aligned pore structure by the freeze-casting method. The lack of studies involving membrane production with tubular freeze-cast substrates warrants more research. In this study, a novel tubular freeze-cast alumina substrate was used for deposition of a silica top layer. The substrate showed radially aligned pores, indicating precise structure control. The obtained pore structure shows high potential for membrane manufacture. The silica layer was produced by the sol-gel method and dip-coated on the substrates with two different withdrawal speeds. The microporous silica showed pores smaller than 2 nm. The highest withdrawal speed resulted in broader substrate coverage. However, a uniform silica layer was only obtained after a second deposition. These results confirm the viability to use tubular freeze-cast substrates for production of nanofiltration membranes.

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Section: Separation Methodsmentioning

confidence: 99%

Section: Separation Methodsmentioning

confidence: 99%

Section: Separation Methodsmentioning

confidence: 99%

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Production and Characterization of a Silica-Alumina Membrane Using Novel Tubular Freeze-Cast Substrates

et al. 2019

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Preparation and Characterization of Some Sol-Gel Modified Silica Coatings Deposited on Polyvinyl Chloride (PVC) Substrates

Purcar

Rădiţoiu

et al. 2020

Coatings

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Transparent and antireflective coatings were prepared by deposition of modified silica materials onto polyvinyl chloride (PVC) substrates. These materials were obtained by the sol-gel route in acidic medium, at room temperature (25 °C), using different alkoxysilanes with various functional groups (methyl, vinyl, octyl or hexadecyl). Physicochemical and microstructural properties of resulted silica materials and of thin coatings were investigated through Fourier Transforms Infrared Spectroscopy (FTIR), UV-Vis spectroscopy, Thermal Gravimetric Analysis (TGA), Dynamic Mechanical Analysis (DMA), Atomic Force Microscopy (AFM) and ellipsometric measurements. Wetting behaviors of the silica coatings were evaluated by measurement of static contact angle against water. FTIR spectra of materials confirmed the high degree of cross-linking that result from the formation of the inorganic backbone through the hydrolysis and polycondensation reactions together with the formation of the organic network. These sol-gel silica coatings showed a reduction in the reflectance (10%) compared with uncoated PVC substrate. AFM reveals that the films are uniform, and adherent to the substrate, but their morphology is strongly influenced by the chemical composition of the coating matrices. These silica coatings can be useful for potential electronic and optical devices.

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Preparation of Antireflective Silica Coating by the Sol-Gel Method for Heliothermic Power Plants

Cited by 2 publications

References 9 publications

Production and Characterization of a Silica-Alumina Membrane Using Novel Tubular Freeze-Cast Substrates

Production and Characterization of a Silica-Alumina Membrane Using Novel Tubular Freeze-Cast Substrates

Preparation and Characterization of Some Sol-Gel Modified Silica Coatings Deposited on Polyvinyl Chloride (PVC) Substrates

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