One-Step Flame Synthesis of Ultrafine SiO2−C Nanocomposite Particles with High Carbon Loading and Their Carbothermal Conversion
| Autor: | Andri Vital, Jörg Richter, Christos G. Aneziris, Thomas Dr. Graule, Johannes Bernardi, Oliver Nagel, Renato Figi |
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| Rok vydání: | 2007 |
| Předmět: |
Hexamethyldisiloxane
Materials science Nanocomposite Silicon General Chemical Engineering Electron energy loss spectroscopy Diffusion flame chemistry.chemical_element General Chemistry Carbon black Industrial and Manufacturing Engineering chemistry.chemical_compound chemistry Chemical engineering Specific surface area Carbon |
| Zdroj: | Industrial & Engineering Chemistry Research. 46:4273-4281 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie061374p |
| Popis: | Submicron-sized silica−carbon composite particles with a high carbon loading were synthesized in a single process step by oxidation of hexamethyldisiloxane vapor in an atmospheric oxygen−fuel diffusion flame. By metered addition of a fuel gas to the flame, the carbon content could be controlled from 1.4 to 14 wt % and the specific surface area was varied from 31 to 121 m2/g. The primary particles in the powders had a size of 20 to 100 nm, were irregularly shaped, and formed arborescent aggregates. The distribution of silicon and carbon within the particles was analyzed by transmission electron microscopy (TEM) with electron energy loss spectroscopy (EELS) and image filtering (EF-TEM). It is shown that, independent of the composition, the individual primary particles consist of nanosized silica and carbon clusters, and form a homogeneous nanocomposite. Heat treatment of the flame-made powders and their mixture with carbon black at 1400 to 1500 °C under argon atmosphere led to fibrous β-SiC/SiO2 composites.... |
| Databáze: | OpenAIRE |
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