Synthesis and physical–chemical properties of hydrolyzed nanosized mesoporous fluorocarbon materials and carbon–fluorocarbon composites
| Autor: | L.M. Levchenko, V.N. Mitkin, I.A. Sukacheva, A.A. Galizky |
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| Rok vydání: | 2011 |
| Předmět: |
Chemistry
Organic Chemistry Inorganic chemistry Oxide chemistry.chemical_element Biochemistry Nanomaterials Inorganic Chemistry symbols.namesake chemistry.chemical_compound Hydrolysis symbols Environmental Chemistry Fluorocarbon Physical and Theoretical Chemistry Fourier transform infrared spectroscopy Mesoporous material Raman spectroscopy Carbon Nuclear chemistry |
| Zdroj: | Journal of Fluorine Chemistry. 132:1134-1145 |
| ISSN: | 0022-1139 |
| DOI: | 10.1016/j.jfluchem.2011.06.043 |
| Popis: | Hydrolysis of nanosized mesoporous superstoichiometric fluorocarbon material FS (CF 1.20 ± 0.03 ) and carbon–fluorocarbon nanocomposites NCFC (CF 0.93 ± 0.03 ) by 10% KOH in aqueous-alcohol solution was studied and yielded two new classes of the hydrolyzed fluorocarbon nanomaterials: hydroxofluorocarbon nano-material FS–OH of general formula sp 3 -C 1− y F n − x (OH) x ( n = 1; x > 0.1, y ∼ 0.05–0.1) and carbon–hydroxofluorocarbon nanocomposites NCFC–OH of general formula sp 2 -C m *sp 3 -C 1− y F n − x (OH) x ( n = 1; x ∼ 0; y ∼ 0.1–0.2). FTIR and Raman studies of FS–OH and NCFC–OH materials have shown that hydrolysis of sp 3 -C–F-bonds in these materials leads a decrease of sp 3 -C–F amount and appearance of characteristic absorption bands for sp 3 -C–OHO, carboxyls and carbonyls, typical for oxidized graphites, carbon blacks and various soots. These phenomena, in combination with C,H,F-analyses for FS–OH and NCFC–OH products have allowed to state that hydrolysis of FS and NCFC in KOH solutions can be explained by the substitution reactions of surface sp 3 -C–F to sp 3 -C–OH and sp 2 >C O containing groups. Observed hydrolytic reactions are also accompanied with processes of the colored solutions origin (yellow – for FS and red-brown – for NCFC). These solutions have UV-VIS spectra identical to graphene oxide and graphitic acid. |
| Databáze: | OpenAIRE |
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