| Project/Area Number |
18550170
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional materials/Devices
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
SAWADA Tsutomu National Institute for Materials Science, Optronic Materials Center, Group Leader (40354378)
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| Co-Investigator(Kenkyū-buntansha) |
FUDOUZI Hiroshi NATIONAL INSTITUTE FOR MATERIALS SCIENCE, Optronic Materials Center, Senior Researcher (20354160)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥4,080,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2007: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2006: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Colloidal crystals / Photonic crystals / Crystal growth / Shear effects / Gelation |
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| Research Abstract |
The purpose of this research is to clarify the characteristics of a new method that could be a East process to firm bulk, single-crystalline photonic crystals consisted of colloidal particles. The method proposed here is that the starting material of polycrystalline colloidal dispersion is realigned into a single-crystalline form by strong shear-flow.
We investigated whether the shear-induced process was effective or not even for bulk samples as thick as millimeter size. Sheared samples were examined by optical spectrometry, and we found that transmittance of the samples was drastically increased and saturated with increasing the shear rate. Dependence of transmittance on the sample thickness was also investigated, and it was suggested that optical quality of the thick samples was as good as the thin sample. This means the shear-induced method is effective also Sir the thick (bulk) samples.
However we encountered a problem for immobilizing the aligned thick colloidal crystals by means of photo-induced gelation. Attenuation of incident light causes insufficient polymerization inside, a sample especially when the sample is thick This problem could not be solved by simply strengthening light-irradiation, which caused deterioration in optical quality of gelled samples, and remained as future works.
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