Photo-induced Surface Property on Transparent Mesoporous Silica Thin Films Containing Single-site Photocatalyst
| Autor: | Makoto Shimada, Shinichiro Nishio, Tsunehiro Tanaka, Norikazu Nishiyama, Sadaharu Imaoka, Kohsuke Mori, Hiromi Yamashita |
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| Rok vydání: | 2008 |
| Předmět: |
polyethylene
Materials science Inorganic chemistry Oxide titanium oxide General Chemistry Polyethylene Mesoporous silica chromium oxide super-hydrophilic property Catalysis Titanium oxide Metal chemistry.chemical_compound chemistry Chemical engineering transparent mesoporous thin film visual_art visual_art.visual_art_medium Photocatalysis Thin film |
| Zdroj: | Topics in Catalysis. 47:116-121 |
| ISSN: | 1572-9028 1022-5528 |
| DOI: | 10.1007/s11244-007-9023-6 |
| Popis: | The transparent Ti-containing or Cr-containing mesoporous silica thin films can be prepared on quartz plate using a spin-coating sol–gel method. The spectroscopic characterization has revealed that these thin films contain isolated and tetrahedrally coordinated titanium oxide moieties and chromium oxide moieties in their frameworks, respectively. These mesoporous silica thin films containing metal oxide moieties have demonstrated a strong hydrophilic surface property even before UV-light irradiation and the appearance of the super-hydrophilic property after UV-light irradiation. Especially, the Cr-containing mesoporous silica (CMS) thin film showed the super-hydrophilic property even under visible light irradiation. In the presence of ethylene gas, the polyethylene was successfully formed on the surface of the CMS thin film under UV-light irradiation. After the formation of polyethylene the surface property of the CMS was converted into hydrophobic while keeping its transparency. The isolated and tetrahedrally coordinated titanium oxide moieties and chromium oxide moieties are responsible for these photo-induced surface reactions. |
| Databáze: | OpenAIRE |
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