Synthesis and characterization of resorcinol–formaldehyde resin chars doped by zinc oxide
| Autor: | V.M. Bogatyrov, Iliya V. Urubkov, O.I. Oranska, Vladimir M. Gun’ko, Jadwiga Skubiszewska-Zięba, Barbara Charmas, Roman Leboda |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Scanning electron microscope Nanoporous Inorganic chemistry Zincite technology industry and agriculture General Physics and Astronomy chemistry.chemical_element Surfaces and Interfaces General Chemistry Resorcinol Zinc Condensed Matter Physics Surfaces Coatings and Films Thermogravimetry chemistry.chemical_compound chemistry visual_art visual_art.visual_art_medium Crystallite High-resolution transmission electron microscopy Nuclear chemistry |
| Zdroj: | Applied Surface Science. 303:263-271 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2014.02.164 |
| Popis: | Polycondensation polymerization of resorcinol–formaldehyde (RF) mixtures in water with addition of different amounts of zinc acetate and then carbonization of dried gels are studied to prepare ZnO doped chars. Zinc acetate as a catalyst of resorcinol–formaldehyde polycondensation affects structural features of the RF resin (RFR) and, therefore, the texture of chars prepared from Zn-doped RFR. The ZnO doped chars are characterized using thermogravimetry, low temperature nitrogen adsorption/desorption, Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and high resolution transmission electron microscopy (HRTEM). At a relatively high content of zinc acetate (1 mol per 10–40 mol of resorcinol) in the reaction mixture, the formation of crystallites of ZnO (zincite) occurs in a shape of straight nanorods of 20–130 nm in diameter and 1–3 μm in length. At a small content of zinc acetate (1 mol per 100–500 mol of resorcinol), ZnO in composites is XRD amorphous and does not form individual particles. The ZnO doped chars are pure nanoporous at a minimal ZnO content and nano-mesoporous or nano-meso-macroporous at a higher ZnO content. |
| Databáze: | OpenAIRE |
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