NDLI: Characterization of methyl-substituted silica gels with Si

Content Provider	Royal Society of Chemistry (RSC)
Author	Babonneau, Florence D'Andrea, Gennaro Sorarù, Gian Domenico Campostrini, Renzo
Copyright Year	1995
Abstract	Gels have been prepared via hydrolysis–condensation reactions of triethoxysilane (TREOS) and methyldiethoxysilane (MDES) in various ratios. The hydrolysis–condensation reactions of the precursors have been investigated by 29Si and 17O solution NMR. Both precursors present a very high reactivity towards hydrolysis and condensation reactions, and formation of co-condensed species will be discussed. These highly reactive precursors lead to transparent gels over a large composition range, 0.1 ⩽ MDES:TREOS ⩽ 10. Their structure was investigated by 29Si MAS NMR, FTIR and DSC: the gels appear as highly condensed homogeneous systems in which the difunctional and trifunctional units are randomly distributed. The microstructure of the gels was also investigated through the measurement of specific surface area and skeletal density. Finally, some physical properties have also been measured such as thermal stability in O2 and inert atmosphere (Ar), coefficient of thermal expansion (α) and elastic modulus (E).
Starting Page	1363
Ending Page	1374
Page Count	12
File Format	PDF
ISSN	09599428
Volume Number	5
Issue Number	9
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9950501363
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	FTIR DSC Oxygen-17 Nuclear magnetic resonance Hydrolysis Magic angle spinning Specific surface area Oxygen Thermal expansion Elastic modulus
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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