2019 Fiscal Year Final Research Report
Design of low-friction lubricant containing nanodiamond particles
| Project/Area Number |
19K21063
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| Project/Area Number (Other) |
18H05882 (2018)
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund (2019)
Single-year Grants (2018) |
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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 | Utsunomiya University |
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Principal Investigator |
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| Project Period (FY) |
2018-08-24 – 2020-03-31
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| Keywords | ナノダイヤモンド / 摩擦低減 / 潤滑油 / 同位体 / TOF-SIMS / 官能基 / エンジンオイル / トライボロジー |
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| Outline of Final Research Achievements |
It is known that the coefficient of friction is reduced by adding nano-diamond particles with a diameter of several nanometers to water. By clarifying the detailed mechanism of friction reduction, it can be applied to the engine oil and expected to improve the fuel efficiency. In this study, functional groups derived from solvent were added to the surface of nano-diamond for friction reduction, and its effect was maximized at sliding parts where the interplanar spacing was controlled uniformly. The interaction between various additives of engine oil (the anti-wear agent, the detergent and the dispersant) was also clarified. These findings lead to the design guideline of the engine oil in which nano-diamond is dispersed.
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| Free Research Field |
マイクロ・ナノ工学
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| Academic Significance and Societal Importance of the Research Achievements |
従来の摩擦解析は事後の試験片表面の解析のみであったのに対し、本研究は試験後のナダイヤモンド粒子を遠心分離で抽出し表面を直接観察すること、更に水素同位体を用いることで、低摩擦化のカギとなる粒子表面の官能基（-OH）が、使われる環境由来であることを明らかにした。この結果は、ナノダイヤモンド粒子を、-OHの供給源となる添加剤と組み合わせて用いることで、持続的に摩擦低減効果が得られることを意味しており、潤滑油を設計する際の重要な指針へと繋がった。
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