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- W37793502 abstract "This chapter explains the processing of glasses from sol–gel monoliths. The physical properties of sol–gel-derived monoliths are unique and offer various approaches to the molecular design of ceramics and glasses. The density of the monolith increases and its volume fraction of porosity decreases during sintering. The porous gel is transformed to a dense glass when all of the pores are eliminated. The densification temperature decreases as the pore radius decreases and the surface area of the gels increases. Silica glass made by densification of porous silica gel is amorphous and is nearly equivalent in structure and density to vitreous silica made by fusing quartz crystals or by the sintering of SiO2 powders made by chemical vapor deposition of SiCl4. Aging of a gel, also called syneresis, involves holding the object in liquid for several hours. During aging, localized solution and reprecipitation of the gel network occurs, which increases the thickness of interparticle necks and decreases the porosity. It is found that the strength of the gel thereby increases with aging." @default.
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- W37793502 date "1991-01-01" @default.
- W37793502 modified "2023-09-23" @default.
- W37793502 title "Glasses from Sol–Gel Monoliths" @default.
- W37793502 doi "https://doi.org/10.1016/b978-0-08-034720-2.50054-x" @default.
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