Otro
Influência da catálise ácida e básica na preparação da sílica funcionalizada pelo método sol-gel
Registro en:
Química Nova. Sociedade Brasileira de Química, v. 25, n. 1, p. 27-31, 2002.
0100-4042
10.1590/S0100-40422002000100006
S0100-40422002000100006
S0100-40422002000100006.pdf
Autor
Nassar, Eduardo José
Messaddeq, Younes
Ribeiro, Sidney José Lima
Resumen
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. Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)