| Autor: |
Luz Sánchez-Silva, José Luis Valverde, Ignacio Gracia, Sandra Víctor-Román, Amaya Romero |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Science of Advanced Materials. 6:665-673 |
| ISSN: |
1947-2935 |
| DOI: |
10.1166/sam.2014.1754 |
| Popis: |
The synthesis of aerogels based on carbon nanofibers (CNF aerogels) by a freeze-drying process has been studied. The influence of the polyvinyl alcohol/carbon nanofibers mass ratio (PVA/CNFs), the type of polymer and the use of functionalized CNFs on the physical properties of the resulting CNF aerogels have been evaluated. The morphology and textural properties of the resulting carbon aerogels were characterised by scanning electron microscopy (SEM) and nitrogen adsorption/desorption techniques. The thermal stability of the synthesized materials under nitrogen and oxygen atmospheres was also evaluated by TGA. Lower amounts of PVA gave rise to CNF aerogels with thicker and more amorphous structure due to CNF aggregation. Furthermore, the surface area and the total pore volume decreased on increasing the PVA/CNF mass ratio. It was found that the nature of the polymer had a marked influence on the morphology of the resulting CNF aerogels. The use of polyvinyl pyrrolidone (PVP) enhanced both the ignition characteristics and thermal stability of the CNF aerogels. Aerogels containing functionalized CNFs showed a high density and a low porosity due to the strong interaction of the latter with the polymer. The CNF aerogels described here could have potential uses as ultralight structural materials, thermal insulators and supercapacitors. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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