| Project/Area Number |
19K05620
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 35020:Polymer materials-related
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| Research Institution | Chitose Institute of Science and Technology |
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Principal Investigator |
Karthaus Olaf 公立千歳科学技術大学, 理工学部, 教授 (80261353)
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| Co-Investigator(Kenkyū-buntansha) |
谷尾 宣久 公立千歳科学技術大学, 理工学部, 教授 (50217121)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | biomimetics / flower petals / transparency / films / fluoropolymer / phase change / micropores / SEM / EDS / inorganic salt / flower petal / porous films / petals / leaves / PVDF copolymer / refractive index / microstructure / polymer films / phase separation |
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| Outline of Research at the Start |
The purpose of this research is the elucidation of the mechanisms by which flower petals turn transparent upon becoming wet. The petal microstructure most likely has air-filled voids that will be imaged by electron microscopy and a biomimetic version of the void structure will be prepared in polymer films. This process can be useful for the formation of reversibly transparent polymer films.
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| Outline of Final Research Achievements |
The internal structure of flower petals was investigated by optical and electron micrsocopy and we found that air-filled voids are responsible for the white color of the petals by strong light scattering. We were able to fill these voids with liquids and gels that led to a change in opacity - the petals became transparent. As a biomimetic analogue we were able to produce porous films of a fluorinated polymer that showed the same change in transparency when dry and wet. In this case, the change was reversible, while in the petal case, it was not.
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| Academic Significance and Societal Importance of the Research Achievements |
Biomimetics can produce functional materials by environmentally friendly processes that are energy-saving. The transparency change of films without any external triggers offers new applications in remote areas and can be used for automatic shading of windows or as sensors.
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