Facile synthesis of silica composite films with good mechanical property for spectrally broadband antireflection coatings

Zhang, Mingfeng; Liu, Qiufen; Tian, Shouqin; Zhou, Xuedong; Liu, Baoshun; Zhao, Xiujian; Tang, Gen; Pang, Aimin

doi:10.1016/j.colsurfa.2021.127255

Cited by 8 publications

(3 citation statements)

References 36 publications

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“…A silica aerogel is a mesoporous solid with outstanding properties, including low thermal conductivity, a low dielectric constant, a low refractive index, and high specific surface area. Silica aerogels are considered as promising materials for thermal insulation [ 1 , 2 ], anti-reflection coatings [ 3 ], low dielectrics [ 4 ], supports for cosmetics [ 5 ], adsorbents [ 6 , 7 , 8 ], and viscosity agents [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Thermal Gelation for Synthesis of Surface-Modified Silica Aerogel Powders

Lee

Nam

et al. 2021

Gels

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A spherical silica aerogel powder with hydrophobic surfaces displaying a water contact angle of 147° was synthesized from a water glass-in-hexane emulsion through ambient pressure drying. Water glass droplets containing acetic acid and ethyl alcohol were stabilized in n-hexane with a surfactant. Gelation was performed by heating the droplets, followed by solvent exchange and surface modification using a hexamethyldisilazane (HMDS)/n-hexane solution. The pH of the silicic acid solution was crucial in obtaining a highly porous silica aerogel powder with a spherical morphology. The thermal conductivity, tapped density, pore volume, and BET surface area of the silica aerogel powder were 22.4 mW·m−1K−1, 0.07 g·cm−3, 4.64 cm3·g−1, and 989 m2·g−1, respectively. Fourier transform infrared (FT–IR) spectroscopy analysis showed that the silica granule surface was modified by Si-CH3 groups, producing a hydrophobic aerogel.

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Section: Introductionmentioning

confidence: 99%

Thermal Gelation for Synthesis of Surface-Modified Silica Aerogel Powders

Lee

Nam

et al. 2021

Gels

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“…It can be observed that the nanopore structures were uniformly distributed on the coating surface, which is caused by the escape of gases such as NO 2 , NH 3 , CO 2 , H 2 O, and others in the mixture coated on the glass during high‐temperature annealing. [ 31,32 ] The EDS maps reveal that Si, O, Y, V, Eu, and Bi elements are uniformly distributed in the coating (Figure 1c). The corresponding cross‐sectional SEM image of the coating is shown in Figure 1d.…”

Section: Resultsmentioning

confidence: 99%

In Situ Generating YVO₄:Eu³⁺,Bi³⁺ Downshifting Phosphors in SiO₂ Antireflection Coating for Efficiency Enhancement and Ultraviolet Stability of Silicon Solar Cells

Zou

et al. 2023

Solar RRL

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Solar photovoltaic (PV) technology is an important way to solve global energy shortages and climate deterioration. [1][2][3][4] Crystalline silicon (c-Si) solar cells dominate the global solar PV market, occupying more than 95%, mainly owing to their superior photoelectric conversion efficiency (PCE), high stability, low cost, nontoxicity, and abundant materials. [5] A key goal of research and production of c-Si solar cells is to increase the PCE and reduce the manufacturing cost, thus reducing the levelized cost of electricity (LCOE). [6] In recent years, the PCE of c-Si solar cells has made tremendous progress due to the rapid development of passivating contact technology, [7][8][9] which is a typical technique for improving the electrical properties of c-Si solar cells. [10,11] However, further improvement of the PCE of c-Si solar cells depends on the cooperative improvement of the optical and electrical properties.Broadening the spectral response is one of the important ways to improve the optical properties of solar cells. To broaden the spectral response of c-Si solar cells, spectral conversion has been widely studied and developed as a promising technology. [12] Luminescence downconversion (including downshifting and quantum cutting) materials, which can absorb high-energy ultraviolet (UV) photons and emit low-energy photons at long wavelengths, can simultaneously improve the conversion efficiency of solar cells or modules [13,14] and enhance their UV stability, [15,16] thus attracting more attention. In addition to causing the aging of module packaging materials, [17] UV irradiation can degrade the electrical performance of solar cells. [18] Recently, Sinha et al. reported that more efficient n-type silicon-based solar cells, especially silicon heterojunction (SHJ) solar cells, are more vulnerable to UV

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“…The voids in the network structure of silica aerogels account for more than 90% of the whole volume. Although silica aerogels are widely used in aerospace vehicles [6][7][8], civil buildings [9,10], clothes [11,12], environmental purification materials [13], and drug delivery systems [14][15][16][17], their characteristics that are not conducive to ductility lead to poor mechanical properties for silica aerogel monoliths. This makes their direct use or hybridization with other materials difficult, which seriously limits the application of silica aerogel in many fields [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Fabrication of Highly Stable Silica Aerogel Microspheres with Core–Shell Structure

Cai

et al. 2023

Polymers

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Silica aerogel microspheres show great potential in various fields as fillings in different materials. It is important to diversify and optimize the fabrication methodology for silica aerogel microspheres (SAMS). This paper presents an eco-friendly synthetic technique for producing functional silica aerogel microspheres with a core–shell structure. Mixing silica sol with commercial silicone oil containing olefin polydimethylsiloxane (PDMS) resulted in a homogeneous emulsion with silica sol droplets dispersed in the oil. After gelation, the droplets were transformed into silica hydrogel or alcogel microspheres and coated with the polymerization of the olefin groups. Microspheres with silica aerogel as their core and polydimethylsiloxane as their shell were obtained after separation and drying. The sphere size distribution was regulated by controlling the emulsion process. The surface hydrophobicity was enhanced by grafting methyl groups onto the shell. The obtained silica aerogel microspheres have low thermal conductivity, high hydrophobicity, and excellent stability. The synthetic technique reported here is expected to be beneficial for the development of highly robust silica aerogel material.

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Facile synthesis of silica composite films with good mechanical property for spectrally broadband antireflection coatings

Cited by 8 publications

References 36 publications

Thermal Gelation for Synthesis of Surface-Modified Silica Aerogel Powders

Thermal Gelation for Synthesis of Surface-Modified Silica Aerogel Powders

In Situ Generating YVO₄:Eu³⁺,Bi³⁺ Downshifting Phosphors in SiO₂ Antireflection Coating for Efficiency Enhancement and Ultraviolet Stability of Silicon Solar Cells

Eco-Friendly Fabrication of Highly Stable Silica Aerogel Microspheres with Core–Shell Structure

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Facile synthesis of silica composite films with good mechanical property for spectrally broadband antireflection coatings

Cited by 8 publications

References 36 publications

Thermal Gelation for Synthesis of Surface-Modified Silica Aerogel Powders

Thermal Gelation for Synthesis of Surface-Modified Silica Aerogel Powders

In Situ Generating YVO4:Eu3+,Bi3+ Downshifting Phosphors in SiO2 Antireflection Coating for Efficiency Enhancement and Ultraviolet Stability of Silicon Solar Cells

Eco-Friendly Fabrication of Highly Stable Silica Aerogel Microspheres with Core–Shell Structure

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In Situ Generating YVO₄:Eu³⁺,Bi³⁺ Downshifting Phosphors in SiO₂ Antireflection Coating for Efficiency Enhancement and Ultraviolet Stability of Silicon Solar Cells