| Project/Area Number |
17350076
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental chemistry
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| Research Institution | Akita University |
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Principal Investigator |
YAMAMOTO Osamu Akita University, Faculty of Engineering and Resource Science, Associate Professor (00230540)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAGAWA Zenbe-e Akita University, Faculty of Engineering and Resource Science, Professor (90016832)
SAWAI Jun Kanagawa Institute of Technology, Faculty of Engineering, Lecturer (80288216)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥11,240,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥540,000)
Fiscal Year 2007: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2006: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2005: ¥6,400,000 (Direct Cost: ¥6,400,000)
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| Keywords | Ceramics / Carbon / Fine particles / Antibacterial activity / Crystal structure / 被覆膜 / 被覆膜形成 / 溶解性 |
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| Research Abstract |
In order to efficiently control the bio-infection to human being by using inorganic materials having high-adsorption and antibacterial activity, carbon thin films with nano-size pores were coated on the surface of ZnO, CaO and so on. Antibacterial activity of as-coated ceramic particles was evaluated by colony count method using Staphylococcus aureus and Escherichia coli. Optimum carbon precursor was found to be poly (vinyl alcohol) with polymerization degree of 2000. Carbon films on the surface of ceramic particles had many pores with the diameter of 1-2 nm, which the amount was 5 mass%, irrespective of the kind of ceramics. By XRD measurement, no peaks corresponding to graphite were detected in carbon-coated ceramic particles; that is, carbon formed on its surface was amorphous. The coated carbon showed hydration resistance in CaO and MgO particles, and inhibited the dissolution of ZnO in acidic solution. Antibacterial activity of the particle decreased with forming carbon thin films, but bacterial adsorption was found on the surface of the coated carbon. In comparison between Staphylococcus aureus and Escherichia coli, it was found that antibacterial activity towards Staphylococcus aureus was stronger than that towards Escherichia coli. As one of application using carbon-coated ceramics, the longevity of a cut flower was studied. From the results, the formation of carbon thin film was found to be effective for longevity of a cut flower, because did not die for 30 days. From evidence described above, the carbon coating may be useful in the development of multifunctional antibacterial materials
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