| Project/Area Number |
19F19100
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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 40020:Wood science-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
齋藤 継之 東京大学, 大学院農学生命科学研究科(農学部), 准教授 (90533993)
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| Co-Investigator(Kenkyū-buntansha) |
SUN ZHIFANG 東京大学, 農学生命科学研究科, 外国人特別研究員
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| Project Period (FY) |
2019-04-25 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2020: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2019: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | セルロースナノファイバー / エアロゲル / 異方性 / cellulose nanofibril / condensation / aerogel / tensile strength / orientation |
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| Outline of Research at the Start |
We envisage that, CNFs can be unidirectionally oriented using our established methods. A dispersion of oriented CNFs can be fixed via cross-linking the interfacial hydroxyl groups with divalent molecules, silica matrix or resorcinol-formaldehyde network. Thus obtained aerogels exhibit typically high porosity and excellent thermal insulating properties. In addition, strong interfacial interactions between cross-linked matrix and well-oriented CNFs render the resultant aerogels high tensile strength, thus addressing a fundamental and ground challenge in the field of aerogels.
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| Outline of Annual Research Achievements |
We have discovered a new, facile, scalable and controllable method to get cellulose nanofibril colloids at any concentrations, using controlled condensation method. All of the condensed CNF materials are highly homogeneous. Further gelation of the condensed CNF hydrogels by protonation (H+) or coordination (Al3+) affords a series of transparent and strong hydrogels with water content of 70-90%, which exhibit tensile strength and modulus more than 9 MPa and 480 MPa, respectively. The water content, strength and modulus are very close or even superior to those of muscles and cartilages and would very promising in the biomedical applications. When dried by supercritical method, we obtained a series of CNF aerogels which is stretchable over 20%, with tensile strength and modulus reach 8 MPa and 100 MPa, respectively, yet still possess very low thermal conductivity at 19.3 mW/mK. Our aerogels, both strong and super-insulating, set a new region in the Ashby plots regarding strength and thermal conductivity.
We have submitted a patent regarding this project. The related manuscript is now under construction, and will submit to several major journals in materials science.
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| Research Progress Status |
令和2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2年度が最終年度であるため、記入しない。
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