| Project/Area Number |
19F19367
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 外国 |
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| Review Section |
Basic Section 26030:Composite materials and interfaces-related
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
KARAHAN HUSEYIN 京都大学, 高等研究院, 外国人特別研究員
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| Project Period (FY) |
2019-11-08 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2021: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 2020: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2019: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | Stable laminate membrane / Hydrogen selectivity / Nanosheet synthesis / Charge compensation / Nanolaminate fabrication / graphene oxide synthesis / membrane preparation |
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| Outline of Research at the Start |
Proposed work involves 3 tasks: 1) preparation of nanosheet-polymer mixtures, 2) fabrication of tape-coated membranes, (3) testing of separation performances. We will employ home-made/commercial graphene oxide nanosheets (negatively charged), and their amine-modified (positively charged) derivatives. To obtain gel-like slurries suitable for tape-coating, we will mix graphenic nanosheets with polymers (polyethyleneimine, polyallylamine). Last, we will prepare thin-film composite membranes by optimizing nanosheet/polymer ratios and casting parameters and test those for hydrogen gas separation.
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| Outline of Annual Research Achievements |
Our research achievements in this project are threefold. First, we have found that the GO-polycation composites coagulate too fast to give uniform slurries and, thus, defect-free gas separation membranes. At high GO-polycation loadings (high concentrations), we could obtain conformal coatings with rod/blade-coating methods. But the resulting membranes became too thick but were still often defective because of fast aggregation. We could produce smoother coatings using non-polyelectrolytes (such as hydrogen-bondable polymers) but still observed only low hydrogen selectivity. However, when we used positively charged nanoparticles and vacuum filtration, we achieved conformal and defect-free membranes, yielding selectivities up to 150 and permeabilities up to around 4000 GPU. Based on the experiments made with polymer-free nanosheet dispersions, we also found that vacuum filtration can be used for compacting membranes that are prepared by other coating methods such as spray-coating. Overall, this collaborative research resulted in the establishment of four fundamental notions: (1) Electrostatic interactions are highly effective in stabilizing GO-based membranes; (2) guided-assembly methods (such as vacuum-assisted filtration and vacuum-spray-coating) should be optimized for achieving defect-free membranes; (3) composite membranes should be polymer-free or rich in nanosheets for developing defect-free membranes with high hydrogen selectivity.
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| Research Progress Status |
令和3年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和3年度が最終年度であるため、記入しない。
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