Comparison of high-purity H2/O2 and LPG/O2 flame-fused silica glasses from sol-gel silica powder

Torikai, Delson; Suzuki, Carlos K.; Shimizu, H.; Ishizuka, T.; Yagi, Jun-ichiro; Orii, K.; Miyakawa, Toru

doi:10.1016/0022-3093(94)90712-9

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…A few of the important advantages of the sol-gel process are its simplicity, and the fact that it is an economic and effective means of producing high-quality materials. Sol-gel processing has found application in the production of high-quality glasses for optical components and fibers, thin film coatings, and fine oxide powders [11][12][13][14][15].…”

Section: Synthesis Of Aerogel By Sol-gel Processmentioning

confidence: 99%

Silica Aerogel: Synthesis and Applications

Gurav

Jung

Park

et al. 2010

Journal of Nanomaterials

601

347

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Silica aerogels have drawn a lot of interest both in science and technology because of their low bulk density (up to 95% of their volume is air), hydrophobicity, low thermal conductivity, high surface area, and optical transparency. Aerogels are synthesized from molecular precursors by sol-gel processing. Special drying techniques must be applied to replace the pore liquid with air while maintaining the solid network. Supercritical drying is most common; however, recently developed methods allow removal of the liquid at atmospheric pressure after chemical modification of the inner surface of the gels, leaving only a porous silica network filled with air. Therefore, by considering the surprising properties of aerogels, the present review addresses synthesis of silica aerogels by the sol-gel method, as well as drying techniques and applications in current industrial development and scientific research.

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Section: Synthesis Of Aerogel By Sol-gel Processmentioning

confidence: 99%

Silica Aerogel: Synthesis and Applications

Gurav

Jung

Park

et al. 2010

Journal of Nanomaterials

601

347

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“…However, the hydroxyl content increased by the order of 100 p.p.m. The amount of hydroxyl aggregated into silica glass by the Verneuil process depends on the type of flame and powders used to obtain the ingots (Torikai et al, 1994). Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The flame-fused silica glass ingots were prepared by the Verneuil technique with a hydrogen/oxygen flame (Torikai et al, 1994) using two kinds of powders: (i) silica glass powder from pure tetramethoxysilane process-made by the Mitsubishi Kasei Corporation (hereafter referred to as amorphous powder); and (ii) natural quartz processed by Toshiba Ceramics Co. (hereafter referred to as crystalline powder). The main characteristics of the powders used in the present investigation are summarized in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…(Torikai et al, 1994). In a recent investigation of amorphous and crystalline powders by the small-angle X-ray scattering (SAXS) technique, an appreciable SAXS intensity was observed for the amorphous powder.…”

Section: Introductionmentioning

confidence: 99%

“…In a recent investigation of amorphous and crystalline powders by the small-angle X-ray scattering (SAXS) technique, an appreciable SAXS intensity was observed for the amorphous powder. The fundamental properties of glass such as viscosity and density have been measured and correlated with the hydroxyl content of the silica glass structure (Shackelford, Masaryk & Fulrath, 1970;Torikai et al, 1994;Sekiya et al, 1996). It is also known that such physical properties depend mainly on their short-and medium-range structure (Briickner, 1970(Briickner, , 1971.…”

Section: Introductionmentioning

confidence: 99%

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Small-Angle X-ray Scattering of Heat-Treated Flame-Fused Silica Glass from Amorphous and Crystalline Powders

Omote

Sekiya²,

Shinoda

et al. 1997

J Appl Cryst

Self Cite

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High-quality as-fused silica glass, heat treated at 1523 K and prepared by the flame-fusion process using natural crystalline quartz and high-purity amorphous silica glass powders, was investigated by small-angle X-ray scattering (SAXS). The X-ray scattering intensity amplitude from the amorphous structure after heat treatment was analysed in terms of viscosity, density and metallic impurity content. It is shown that SAXS scattering of the amorphous sample is sensitive to the structural change induced by annealing.

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Silica, Vitreous Silica

Sempolinski

Schermerhorn

2000

Kirk-Othmer Encyclopedia of Chemical Technology

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Vitreous silica is a high temperature, single‐component glass commercially available in a wide range of purities. It has superior chemical resistance, low thermal expansion, and excellent optical transmission from the uv to the near‐ir. Thermal history and trace contamination can have significant effects on a number of properties, ranging from electrical conductivity to absorption characteristics. Vitreous silica is the material of choice for a variety of commercial and scientific applications, including tubing and containers for chemical processing, uv‐optical elements, envelope material of mercury vapor lamps, and windows for space vehicles. Vitreous silica's high viscosity, even at its melting point, precludes the use of traditional glass‐forming techniques. Manufacture usually involves specialized methods, such as flame hydrolysis or high temperature sintering in helium or vacuum.

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Comparison of high-purity H2/O2 and LPG/O2 flame-fused silica glasses from sol-gel silica powder

Cited by 8 publications

References 5 publications

Silica Aerogel: Synthesis and Applications

Silica Aerogel: Synthesis and Applications

Small-Angle X-ray Scattering of Heat-Treated Flame-Fused Silica Glass from Amorphous and Crystalline Powders

Silica, Vitreous Silica

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