| Project/Area Number |
22KJ2088
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| Project/Area Number (Other) |
21J21971 (2021-2022)
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Multi-year Fund (2023)
Single-year Grants (2021-2022) |
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| Section | 国内 |
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| Review Section |
Basic Section 40020:Wood science-related
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| Research Institution | Osaka University |
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Principal Investigator |
Huang Yintong 大阪大学, 工学研究科, 特別研究員(DC1)
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| Project Period (FY) |
2023-03-08 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2023: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2022: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2021: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | Cellulose nanopaper / Porous structures / Light transmittance / Gas transportability / Air permeablity / Flow transportability |
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| Outline of Research at the Start |
Wood-derived materials have porous structures ranging from nano- to micro-scale which are resulted from the cellulose fiber networks and are expected to be applied as flow transport channels. This research aims to control the morphology of the porous structures within the wood-derived materials and clarify their relationship with the flow transport performance for liquids, gases, light, etc. Then, the application for novel wood-derived devices that take the advantage of the nano- to micro-scale porous structures, such as solar vapor generators, will be explored.
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| Outline of Annual Research Achievements |
In the final year, this research focused on the challenge of achieving coexistence between air and light transportability in cellulose nanopaper.
Achieving light and gas transportability concurrently is challenging for continuous materials. Previous findings showed a cellulose nanopaper, which was made from cellulose nanofibers with a width of 22 ± 8 nm, with porous nanostructures capable of both light transportability and water vapor transportability. However, its translucency has presented some limitations to its further development in high light transportability. Thus, in this financial year, the preparation process for cellulose nanopapers with high light- and gas-transportability was established. 2,2,6,6-Tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibers with a width of 3-4 nm were used as raw materials. To suppress aggregation of the nanofibers during farbrication of nanopaper, a solvent exchange process was conducted with ethanol (EtOH) and then hexane. The resulted hexane-exchanged nanopaper showed effective suppression of aggregation, exhibiting porous structures with dispersed nanofiber networks and interlayer pore spaces. Thus, the air transportability of the hexane-exchanged nanopaper was facilitated, resulting in ten to the sixth times higher air transportability while maintaining high total light transportability compared to conventional nanopaper made from TEMPO-oxidized cellulose nanofibers.
These research findings were reported in 1 peer-reviewed international journal article (accepted by RSC Advances).
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