Preparation of zinc oxide ceramics with a sustainable antibacterial activity under dark conditions
| Autor: | Masaki Kato, Kazuhiko Tsukagoshi, Ken Hirota, Tooru Tanigawa, Hiroshi Sugimoto, Maiko Sugimoto |
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| Rok vydání: | 2010 |
| Předmět: |
Aqueous solution
Materials science Photoluminescence Process Chemistry and Technology Inorganic chemistry Sintering chemistry.chemical_element Zinc Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Zinc nitrate visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Antibacterial activity Nutrient agar Nuclear chemistry |
| Zdroj: | Ceramics International. 36:497-506 |
| ISSN: | 0272-8842 |
| Popis: | Fabrication of ZnO ceramics with a sustainable antibacterial activity even in the dark has been conducted. Fine ZnO powders were hydrothermally treated in 0.5–3 mol ml−1 Zn(NO3)2 aqueous solutions at 110–180 °C for 3–20 h. After an uniaxial pressing of the ZnO powders thus prepared, they were sintered at 400–600 °C for 1 h in air. Sustainability in antibacterial activity was evaluated using a colony count method with Escherichia coli bacteria on nutrient agar medium (36 °C/24 h) in a Na–P-buffer solution. The best data was attained for the ZnO ceramics prepared from the following conditions: a 3 mol ml−1 zinc nitrate solution for the hydrothermal treatment at 120 °C for 7 h and sintering in air with a step-by-step pattern (470 °C/1 h–485 °C/1 h–500 °C/1 h). ESR and chemical photoluminescence analyses have cleared that radical oxygen of super-oxide ( O2−) originated from the surface of ZnO might exhibit an antibacterial activity even under the dark condition. |
| Databáze: | OpenAIRE |
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