Thermogravimetric investigations during the synthesis of silica-based MCM-41
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Kluwer Academic Publ
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Resumo
MCM-41 material was synthesized starting from hydrogel containing colloidal fumed silica, sodium silicate, cetyltetramethylammonium bromide (CTMABr) as surfactant, and distilled water as solvent. These reactants were mixed to obtain a gel with the following composition: 4SiO(2):1Na(2)O:1CTMABr:200H(2)O. The hydrogel with pH=14 was hydrothermally treated at 100 degreesC, for 4 days. Each day, the pH was measured, and then adjusted to 9.5-10 by using 30% acetic acid solution. Thermogravimetry was the main technique, which was used to monitor the participation of the surfactant on the MCM-41 nanophase, being possible to determine the temperature ranges relative to water desorption as well as the surfactant decomposition and silanol condensation.
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hydrothermal synthesis, MCM-41, thermogravimetry
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Inglês
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Journal of Thermal Analysis and Calorimetry. Dordrecht: Kluwer Academic Publ, v. 64, n. 2, p. 801-805, 2001.
