Thermal and structural characterization of TiO2 and TiO2/polymer micro hollow spheres
| Autor: | Jürgen Bertling, M. Sgraja, Peter J. Jansens, Jan Blömer |
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| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Materials science
Precipitation (chemistry) Scanning electron microscope General Chemical Engineering technology industry and agriculture Mineralogy Infrared spectroscopy Sulfuric acid General Chemistry engineering.material Industrial and Manufacturing Engineering law.invention chemistry.chemical_compound Coating chemistry Chemical engineering law Titanium dioxide engineering Calcination Tetradecane |
| Popis: | Micro hollow spheres, synthesized by the coating of tetradecane filled microcapsules with titanium dioxide, are characterized using thermal gravimetry (TG), infrared spectroscopy (IR), Hg-porosimetry and scanning electron microscopy (SEM). The investigations show a strong dependence of the coating efficiency on the initial pH (precipitation in water or dilute sulfuric acid) as well as the specific capsule surface present in solution. Since the process is dominated by heterogeneous precipitation, the coating efficiency is governed by the counteracting processes of capsule-TiO 2 and TiO 2 -TiO 2 agglomeration. TG-IR analysis of the capsules shows the vaporization of tetradecane prior to the decomposition of the polymeric wall to carbon monoxide, carbon dioxide and water. After the extraction or calcination of the core microcapsules, stable inorganic and organic-inorganic hollow spheres are obtained. |
| Databáze: | OpenAIRE |
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