Influência da catálise ácida e básica na preparação da sílica funcionalizada pelo método sol-gel
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Data
2002-02-01
Autores
Nassar, Eduardo José
Messaddeq, Younes [UNESP]
Ribeiro, Sidney José Lima [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Química
Resumo
Some aspects of the chemistry involved in the preparation and characterization of functionalized silicon oxide by sol-gel method are considered in this work. The synthesis was performed with different silicon alcoxide precursors and the influence of the acid and basic catalyst was investigated. Characterization was performed by infrared absorption spectroscopy, elemental analysis and 29Si NMR. Infrared data show Si-C and -CH2- vibrational modes at 1250 to 1280 and 2920 to 2940 cm-1, respectively. The elemental analysis confirmed the presence of organic groups in the inorganic silica network. 29Si NMR results show different hydrolisys depending on the acid or base catalysis.
Descrição
Palavras-chave
sol-gel, RMN 29Si and 13C, silica
Como citar
Química Nova. Sociedade Brasileira de Química, v. 25, n. 1, p. 27-31, 2002.