Surface and Structural Modification of Nanostructured Mesoporous Silicon Oxycarbide Glasses Obtained from Preceramic Hybrids Aged in NH4 OH

Autor:	Fausto Rubio, José Luis Oteo, Juan Rubio, Aitana Tamayo
Rok vydání:	2012
Předmět:	Materials science Dangling bond chemistry.chemical_element Silicon oxycarbide Microporous material Characterization (materials science) chemistry Materials Chemistry Ceramics and Composites Lewis acids and bases Composite material Mesoporous material Hybrid material Carbon
Zdroj:	Journal of the American Ceramic Society. 96:323-330
ISSN:	0002-7820
DOI:	10.1111/jace.12000
Popis:	Highly meso-porous silicon oxycarbide glasses have been obtained from preceramic hybrid materials aged in NH4OH solutions. Surface characterization reveals the amphoteric character of the surface because of the presence of carbon and silica nanodomains. The dependence of the surface Lewis base constant with the concentration of the NH4OH solution suggests different distribution in the carbon nanodomains because of the addition of the aging solution. Structural characterization reports on the increase in the crosslinking degree in the materials treated in NH4OH, whereas the number of dangling bonds increases significantly in the microporous material taken as a reference.
Databáze:	OpenAIRE
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