Fabrication of transparent amorphous silica by controlling forming and sintering processes with spherical nano-silica powder

Ahn, Yoo Kyoung; Kim, Dong Hwi; Lim, Hyung Sup; Lee, Sang Jin

doi:10.1007/s43207-022-00235-8

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…Cristobalite is used in a wide variety of industries for a variety of purposes. Because of its resistance to very high temperatures, it finds widespread use in the ceramics and refractory sectors of the economy [11]. In addition to this, it has applications in the manufacturing of glass and in the electrical sector, particularly in the creation of optical fibers.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Heat Treatment Temperature on the Process of Obtaining Material From Recycled and Crushed Glass, Used in Various Applications

Epure,

Munteanu,

Istrate

et al. 2023

IJMMT

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This study aims to investigate the influence of the treatment temperature on the mechanical properties of recycled and crushed glass (RCG) and to develop new materials in the civil field (interiors, art objects, constructions, etc.). Crushed glass (RCG) was thermally treated through a crystallization process in stages (T1, T2, T3, etc.). This method involves gradual heating in stages: the first stage at a constant temperature (T1) between 700 and 870°C; the second stage holding at constant and varied temperatures (T2) of 800, 850, 870, and 900°C for one hour or two hours; and the third stage, controlled cooling (T3) for 2 hours up to 500°C. Due to the thermal treatment in stages, it was found that the crystallization process can be controlled, helping to obtain a variety of materials that can be used in various applications. X-ray diffraction highlighted the structural changes, the identification of the component phases, and the variations of the network parameters. The results of this study support the use of glass (RCG) in a number of civil applications due to the control over the crystallization process by heat treatment.

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Section: Resultsmentioning

confidence: 99%

The Influence of Heat Treatment Temperature on the Process of Obtaining Material From Recycled and Crushed Glass, Used in Various Applications

Epure,

Munteanu,

Istrate

et al. 2023

IJMMT

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“…Aerogels are known as highly porous materials (up to ~90 porosity). Aerogels can serve as thermal super-insulators for their low density (80–200 kg/m 3 ), which minimizes heat conduction by having low thermal conductivity [ 1 , 2 ]. Because of this excellence, aerogels are lightweight materials with the most excellent insulation properties.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Surface-Modified Hollow-Silica (SiO2) Aerogel Particles via Oil–Water–Oil Double Emulsion Method

Kapadnis,

Nam,

Kim

et al. 2024

Gels

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Due to their high surface area and low weight, silica aerogels are ideally suited for several uses, including drug delivery, catalysis, and insulation. Oil–water–oil (OWO) double emulsion is a simple and regulated technique for encasing a volatile oil phase in a silica shell to produce hollow silica (SiO2) aerogel particles by using hydrophilic and hydrophobic emulsifiers. In this study, the oil–water–oil (OWO) double emulsion method was implemented to synthesize surface-modified hollow silica (SiO2) aerogel particles in a facile and effective way. This investigation mainly focused on the influence of the N-hexane-to-water glass (OW) ratio (r) in the first emulsion, silica (water glass) content concentration (x), and surfactant concentration (s) variations. Furthermore, surface modification techniques were utilized to customize the aerogel’s characteristics. The X-ray diffraction (XRD) patterns showed no imprints of impurities except SiO2. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images highlight the hollow microstructure of silica particles. Zeta potential was used to determine particle size analysis of hollow silica aerogel particles. The oil–water–oil (OWO) double emulsion approach was successfully employed to synthesize surface-modified hollow silica (SiO2) aerogel particles, providing precise control over the particle characteristics. By the influence of the optimization condition, this approach improves the aerogel’s potential applications in drug delivery, catalysis, and insulation by enabling surface modifications.

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“…However, in practice, the main obstacle to the sintering of glass powders is their tendency to crystallize, which inhibits the viscous flow of the glass phase and results in residual pores after sintering. [18][19][20][21][22] The residual pores and crystalline phases lead to light scattering at the pore-solid interfaces and glass-crystal interfaces, thus limiting the transparency of the sintered components to what the cast glass can achieve. As a result, the application of glass components manufactured using the sintering method is restricted in optical applications.…”

Section: Introductionmentioning

confidence: 99%

“…In the literature, the glass compositions that can achieve transparent glass components using the sintering method are mostly pure SiO 2 or predominantly composed of SiO 2 . [19][20][21][22][23][24][25][26][27][28][29][30][31][32] This is because silicate glasses usually have high glass transition temperature (T g ), excellent thermal stability, and are less prone to crystallization during sintering. On the other hand, there is limited literature on the preparation of transparent glasses of low T g by sintering method.…”

Section: Introductionmentioning

confidence: 99%

Preparation of transparent Bi₂O₃‐ZnO‐B₂O₃ glass by conventional sintering at low temperatures

Shyu,

2023

J Am Ceram Soc.

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Glass components fabricated by the sintering route have wide‐ranging applications. However, one issue is that the crystallization tendency of glass powders often leads to residual pore‐glass interfaces and crystal‐glass interfaces, thereby causing strong light scattering and rendering the sintered glass opaque. This issue is particularly pronounced in glasses with a low glass transition temperature (Tg) due to their weak bonding and thus high crystallization tendency. In the present study, a Bi2O3‐ZnO‐B2O3 glass with a low Tg of 364°C was fabricated using the conventional sintering method to explore whether transparent glass materials can be obtained. The temperature range of crystallization of the glass powders was analyzed using differential scanning calorimetry. X‐ray diffraction was employed to analyze the crystalline phases formed in the sintered glasses. The microstructure of the sintered glasses was examined using scanning electron microscopy. The optical transmittance of the sintered glasses was measured using ultraviolet‐visible spectroscopy. The results show that transparent sintered glasses with the highest transmittance of 54% at the wavelength of 650 nm can be obtained by using a coarser initial particle size, lower forming pressure, and an appropriate sintering temperature/time (430°C/30 min). It is suggested that this combination of processing parameters can suppress glass crystallization while maintaining a low glass viscosity during sintering.

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Fabrication of transparent amorphous silica by controlling forming and sintering processes with spherical nano-silica powder

Cited by 7 publications

References 22 publications

The Influence of Heat Treatment Temperature on the Process of Obtaining Material From Recycled and Crushed Glass, Used in Various Applications

The Influence of Heat Treatment Temperature on the Process of Obtaining Material From Recycled and Crushed Glass, Used in Various Applications

Facile Synthesis of Surface-Modified Hollow-Silica (SiO2) Aerogel Particles via Oil–Water–Oil Double Emulsion Method

Preparation of transparent Bi₂O₃‐ZnO‐B₂O₃ glass by conventional sintering at low temperatures

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Fabrication of transparent amorphous silica by controlling forming and sintering processes with spherical nano-silica powder

Cited by 7 publications

References 22 publications

The Influence of Heat Treatment Temperature on the Process of Obtaining Material From Recycled and Crushed Glass, Used in Various Applications

The Influence of Heat Treatment Temperature on the Process of Obtaining Material From Recycled and Crushed Glass, Used in Various Applications

Facile Synthesis of Surface-Modified Hollow-Silica (SiO2) Aerogel Particles via Oil–Water–Oil Double Emulsion Method

Preparation of transparent Bi2O3‐ZnO‐B2O3 glass by conventional sintering at low temperatures

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Preparation of transparent Bi₂O₃‐ZnO‐B₂O₃ glass by conventional sintering at low temperatures