Synthesis and properties of MCM-41 with polymerizable CADMA cationic surfactant
| Autor: | Isabella P. Alkimim, Pablo A.S. Vasquez, Laura L. Silva, Dilson Cardoso |
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| Rok vydání: | 2017 |
| Předmět: |
Small-angle X-ray scattering
Inorganic chemistry Cationic polymerization 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences Thermogravimetry chemistry.chemical_compound chemistry Polymerization Pulmonary surfactant MCM-41 Bromide 0210 nano-technology Nuclear chemistry Methyl group |
| Zdroj: | Catalysis Today. 289:2-13 |
| ISSN: | 0920-5861 |
| Popis: | The synthesis route of MCM-41 was modified by using a cationic surfactant different from the usual CTMABr (cetyltrimethylammonium bromide). This surfactant, cetylallyldimethylammonium bromide (CADMABr), differs from CTMABr by the substitution of a methyl group located in the hydrophilic head by a polymerizable allyl group. The CADMABr surfactant and the CADMA-MCM-41 hybrid silica were synthesized using different times. Formation of the surfactant was confirmed using elemental analysis (CHN), 13C nuclear magnetic resonance (13C NMR), and small-angle X-ray scattering (SAXS) applied to the dispersions of different concentrations of the surfactants in water. The aqueous dispersions of CADMABr and the hybrid silicas were irradiated at different doses of gamma (γ) radiation in order to obtain information about the polymerization of the surfactant. The hybrid silicas were characterized using X-ray diffraction (XRD) for phase identification, together with thermogravimetry (TGA), nitrogen physisorption, and scanning electron microscopy (SEM). The catalytic properties of the silicas were evaluated using the transesterification reaction of monoalcohols as a model for application in biodiesel manufacture. |
| Databáze: | OpenAIRE |
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