Effects of oxidizing procedures on carbon nanofibers surface and dispersability in an epoxy resin
Different oxygen functionalities were introduced in fishbone-type carbon nanofibers (CNFs) using three different oxidation procedures. The differences between these procedures are mainly based in the oxidizing agent used and the acid medium in which the process was carried out. Potassium permanganat...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Universidad de Castilla-La Mancha |
| Repositorio: | RUIdeRA. Repositorio Institucional de la UCLM |
| OAI Identifier: | oai:ruidera.uclm.es:10578/29873 |
| Acceso en línea: | http://hdl.handle.net/10578/29873 |
| Access Level: | acceso abierto |
| Palabra clave: | Graphite Graphene Carbon nanofibers Oxidation Epoxy resin Dispersion Grafito Grafeno Nanofibras de carbono Oxidación Resina epoxica Dispersión |
| Sumario: | Different oxygen functionalities were introduced in fishbone-type carbon nanofibers (CNFs) using three different oxidation procedures. The differences between these procedures are mainly based in the oxidizing agent used and the acid medium in which the process was carried out. Potassium permanganate-, ferrate- and chromate-based approaches were employed in conjunction with exfoliation and subsequent reduction with hydrazine. A complete evaluation of the effects produced by the different oxidative treatments on the resulting materials was carried out. The obtained materials were characterized by Scanning Electron Microscopy (SEM), EDX, RAMAN, Fourier Transform Infrared (FTIR), X-ray diffraction (XRD), N2 adsorption/desorption measurements, particle size and thermogravimetric analysis. The results suggest that only those procedures in which H2SO4 was used as acid medium (i.e., potassium permanganate and ferrate processes) were fit to achieve intercalation of suitable species (SO42− ions) that weaken the van der Waals forces. The weakening of these forces facilitates the attack of the carbon skeleton by the strong oxidants MnO4− or FeO42–and, as a consequence, the fragmentation of the material occurs. Dispersibility of carbon materials are affected by functional groups and oxidation degree. Turbiscan stability index provide a useful tool in order to study the stability of carbon material into different solvents with different dipole moments: water, epoxy resin and decane. |
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