Preparation of a gel from metal alkoxide and its properties as a precursor of oxide glass

Autor:	Masayuki Yamane, Shinji Aso, Teruo Sakaino
Rok vydání:	1978
Předmět:	Materials science Mechanical Engineering Inorganic chemistry Oxide Hydrolysis chemistry.chemical_compound Ammonia chemistry Chemical engineering Polymerization Mechanics of Materials Specific surface area Alkoxide General Materials Science Ammonium Methanol
Zdroj:	Journal of Materials Science. 13:865-870
ISSN:	1573-4803 0022-2461
DOI:	10.1007/bf00570525
Popis:	Basic research on 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. Disks of dried gel were prepared without fracture by adding the necessary amount of water for hydrolysis into a methanol solution of silicon tetramethoxide, followed by drying the formed gel while keeping the vapour pressure of the methanol under control. The dried gel was porous with micropores ranging from 15 to 100 A in diameter. It had a specific surface area of more than 300 m2 g−1 and about 30% porosity. Monolithic gel was also prepared by using dilute ammonia water for hydrolysis. The time taken to gel became shorter with increasing ammonium ion concentration, but resulted in a gel of coarser structure. Dehydration polymerization of 60 to 75% occurred at room temperature. The polymerization was more pronounced in gels made with higher ammonium concentrations, but the amount of unreacted ethoxy group was also larger in these gels.
Databáze:	OpenAIRE
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