Fullerenes and their ions in hydrocarbon flames
| Autor: | P. Weilmünster, M. Bachmann, J. Griesheimer, Th. Baum, K.-H. Homann, R. Kovacs, J. Ahrens |
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| Rok vydání: | 1994 |
| Předmět: |
chemistry.chemical_classification
Fullerene chemistry Fullerene Hydrogen chemistry.chemical_element medicine.disease_cause Photochemistry Soot Ion chemistry.chemical_compound Hydrocarbon chemistry Acetylene Physics::Atomic and Molecular Clusters medicine Physics::Chemical Physics Benzene Astrophysics::Galaxy Astrophysics Spectroscopy |
| Zdroj: | International Journal of Mass Spectrometry and Ion Processes. 138:133-148 |
| ISSN: | 0168-1176 |
| DOI: | 10.1016/0168-1176(94)04036-2 |
| Popis: | The formation of both positive and negative fullerene ions from C−30 to >C+650 in premixed low-pressure flames of acetylene, 1,3-butadiene, benzene, and napthalene with oxygen is reported and reviewed. For benzene, the formation both of uncharged fullerenes and of their ions is compared. Fullerenes are formed in the soot-free oxidation zone and also at the beginning of soot formation in the burned gas. Their increase is strongly correlated with the concentration of polycyclic aromatic hydrocarbons (PAHs) in the flame and ceases when the PAHs are consumed or oxidized. Without the presence of PAHs soot is not a source of fullerenes. Species which already have the necessary number of C atoms but still contain a few H atoms could be detected as fullerene precursors. They were most sensitively detected in the negatively charged state. When the temperature decreases in the burned gas, fullerene ions add H atoms. The extent of acquisition of hydrogen depends on the occurrence of adjacent pentagons, which is always the case in fullerenes |
| Databáze: | OpenAIRE |
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