2022 Fiscal Year Final Research Report
Revelation of lubrication mechanisms of 100% cellulose nanofiber moldings by a tribo-operand spectroscopic method
| Project/Area Number |
21K20402
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
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| Research Institution | Yokohama National University (2022)
Kyoto Institute of Technology (2021) |
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Principal Investigator |
Okubo Hikaru 横浜国立大学, 大学院環境情報研究院, 助教 (50906352)
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| Project Period (FY) |
2021-08-30 – 2023-03-31
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| Keywords | セルロースナノファイバー / トライボロジー / その場観察 / 超低摩擦 / オペランド計測 |
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| Outline of Final Research Achievements |
In this study, we investigated the basic tribological properties and friction surface structure of a 100% cellulose nanofiber (CNF) molding. From the results, the CNF molding exhibits ultra-low friction under specific lubrication conditions: under a lubrication with a polar oil or high-temperature dry friction conditions. For the lubrication with the polar oil, the functional group denaturation of the CNF surfaces progresses on the frictional surface, and it results in the formation of a specific solid-liquid interface structure that exhibiting ultra-low friction. Under high-temperature dry friction conditions, amorphous CNFs film forms at the friction interface, and it was concluded that such a specific film exhibits ultra-low friction. We will further elucidate the lubrication mechanism of the CNF moldings and develop the CNF molding with advanced features based on the mechanism.
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| Free Research Field |
トライボロジー
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| Academic Significance and Societal Importance of the Research Achievements |
CNFを材料に導入することで，機械特性やトライボロジー特性を制御しようとする研究開発はこれまでも実施されているが，いずれも材料に対するセルロース・CNF濃度は数％程度であり，そのトライボロジー現象は母材の材料に依るところが大きい．本研究は，単成分で高い機械的強度と特異的な特性を有するCNFを濃度100%の成形体として摺動材料として取い，超低摩擦性を獲得するシステム設計を見出した点で，学術的・産業的な意義は大きい．また，本研究で扱ったCNF成型体は，カーボンニュートラルに資する100%バイオマス素材で構築された材料であり，この100%CNF成型体の実用性を示した本研究の社会的意義は大きい．
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