Nanocomposites with fumed silica/poly(vinyl pyrrolidone) prepared at a low content of solvents
| Autor: | O. E. Voronina, E. F. Voronin, Vladimir M. Gun’ko, Jadwiga Skubiszewska-Zięba, O. A. Kazakova, E.M. Pakhlov, Roman Leboda, L.V. Nosach, N.V. Guzenko |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
technology industry and agriculture General Physics and Astronomy Infrared spectroscopy macromolecular substances Surfaces and Interfaces General Chemistry Condensed Matter Physics Surfaces Coatings and Films Solvent Adsorption Chemical engineering Specific surface area Polymer chemistry Solvent effects Ball mill Fumed silica Hydrophobic silica |
| Zdroj: | Applied Surface Science. 253:2801-2811 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2006.05.065 |
| Popis: | Highly disperse nanocomposites with fumed silica/poly(vinyl pyrrolidone) (PVP) prepared using different methods were studied by infrared spectroscopy, adsorption, and quantum chemistry methods. Low amounts of water or ethanol (30 wt.% with respect to the silica content) promote appropriate distribution of PVP on silica particles. The use of ethanol leads to a smaller loss of the specific surface area ( S BET ) than in the case of water used as a solvent. On PVP distribution on a silica surface, treatment of the system in a pseudo-liquid state reactor (PLSR) provides slightly better results (a lower loss in S BET ) in comparison with mechanochemical activation (MCA) in a ball mill at the PVP monolayer coverage. An increase in the activation time to 6–9 h leads to an increase in the |Δ S BET / S BET | value to 0.29–0.35 for both treatment methods. |
| Databáze: | OpenAIRE |
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