Comparative temporal analysis of multiwalled carbon nanotube oxidation reactions: Evaluating chemical modifications on true nanotube surface
| Autor: | Adelina P. Santos, Flávia G. Pacheco, Honória de Fátima Gorgulho, Waldemar A. A. Macedo, Alexandre A. C. Cotta, Clascídia A. Furtado |
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| Rok vydání: | 2015 |
| Předmět: |
Nanotube
Materials science Inorganic chemistry General Physics and Astronomy Surfaces and Interfaces General Chemistry Condensed Matter Physics Multiwalled carbon Redox Surfaces Coatings and Films chemistry.chemical_compound chemistry Dimethylformamide Organic chemistry Surface modification Composition (visual arts) Hydrogen peroxide Dispersion (chemistry) |
| Zdroj: | Applied Surface Science. 357:1015-1023 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2015.09.054 |
| Popis: | The influence of extensive purification on oxidized multiwalled carbon nanotube surface composition was studied through the characterization and differentiation of the actual surface submitted to three oxidation methods: microwave-assisted acid oxidation, hydrogen peroxide reflux, and Fenton reaction. The oxidized samples were purified by a multi-step procedure including the sequential use of basic reflux and dispersion in dimethylformamide (DMF). The results showed a significant increase in the amount of oxidation debris with hydrogen peroxide and Fenton reaction times longer than 8 h and strong surface characteristic modification. With regard to sample purification, basic reflux led to a reduction in oxygenated group concentration of only 10% in the samples treated by acid oxidation. On the other hand, the subsequent use of DMF led to a further decrease in concentration of 39%, proving to be a more efficient method for the removal of oxidation debris. |
| Databáze: | OpenAIRE |
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