Journal ArticleDOI
Introduction and effect of structural variations in inorganic polymers and glass networks
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In this article, a model of silica network formation from silicon alkoxides is used as a model in driving relationships between physical and structural parameters, and supporting experimental evidence is presented.Abstract:
Oxide glasses, being thermoplastic polymers, should be subject to considerable property variations as a result of differences in the network structure. Melting point, viscosity, and strength are among the properties that are closely related to network connectivity and distribution of the network bonds in the polymer. Glass formation by melting, however, does not allow a significant variation in network parameters, except by compositional changes. Chemical polymerization, on the other hand, permits the introduction of structural variations into the polymer network, and provides preparation of modified oxide glasses without compositional alterations. Silica network formation from silicon alkoxides is used as a model in driving relationships between physical and structural parameters, and supporting experimental evidence is presented. Some general effects of these parameters in several glass systems are included.read more
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Hydrolysis of titanium alkoxide and effects of hydrolytic polycondensation parameters
TL;DR: In this paper, it is shown that there is a window in the acid concentration which provides long-term solution stability, and that the gels formed from these clear solutions shrink in their liquor under certain conditions and the introduction of hydrogen peroxide into the liquor causes vigorous gel shrinkage.
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Principles of hydrolysis and condensation reaction of alkoxysilanes
TL;DR: In this article, the basic results of the co-condensation of ≡ Si-C-containing with non-Si-C -containing silanes are reported and a review of papers from different fields is presented.
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Anti-reflection (AR) coatings made by sol–gel processes: A review
TL;DR: In this paper, the development of sol-gel derived anti-reflection (AR) coating on different substrates for various applications in the past 40 years is reviewed. And the major approaches to fabricate AR coating and their characteristics have been discussed.
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Structural considerations about SiO2 glasses prepared by sol-gel
TL;DR: In this paper, the transformation with temperature of SiO2 gels has been studied using IR spectroscopy together with measurements of density and specific surface area, thermal analysis and SEM, and the IR spectra of these gels, measured as a function of temperature and H2O/TEOS ratio, confirm that the relative concentration of OH groups is temperature dependent.
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Preparation of glass by sintering
TL;DR: In this article, a classification of sintering processes includes: (a) sinterting of premelted and pulverized glasses; (b) Sintering of chemically treated glass; (c) sinting without melting; (d) sincing with melting; and (e) Sincing without, or simultaneously with, melting.
References
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Journal ArticleDOI
Glasses from metal alcoholates
Sumio Sakka,Kanichi Kamiya +1 more
TL;DR: In this paper, the technique of preparing oxide glasses from metal alcoholates through hydrolysis, gelling and heating at low temperatures has been reviewed, which makes it possible to produce very high purity and compositions which the conventional melting technique could not give because of immiscibility, crystallization and high melting temperatures.
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Preparation of glasses and ceramics from metal-organic compounds
TL;DR: A significant recent development in this field has been the preparation of monolithic glass and ceramic material without the need of melting or high temperature sintering as discussed by the authors, which can take place by chemical polymerization at room temperatures.
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Monolithic glass formation by chemical polymerization
TL;DR: In this article, it has been shown that monolithic oxide glasses can be formed by chemical polymerization at low temperatures and that high-temperature reactions such as crystallization, phase separation, etc., which restrict glass formation in certain systems and regions, can largely avoid.
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Formation of titania-silica glasses by low temperature chemical polymerization
TL;DR: In this article, clear titania glasses were formed by a low temperature chemical polymerization technique in the TiO2SiO2 binary, which required initial formation of soluble intermediate species capable of polymerizing into an oxide network.
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Preparation of a gel from metal alkoxide and its properties as a precursor of oxide glass
TL;DR: In this paper, the formation of monolithic gel as the precursor of oxide glass has been done concerning the hydrolysis and gelling of silicon tetramethoxide and the properties of dry gel.