2023 Fiscal Year Final Research Report
Development of nano-rheometry technology to elucidate relationship between application properties of gels and pastes and their microstructures
| Project/Area Number |
21K18686
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 19:Fluid engineering, thermal engineering, and related fields
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
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| Project Period (FY) |
2021-07-09 – 2024-03-31
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| Keywords | レオメトリー / ナノインデンテーション試験 / 球状圧子 / 塗布 |
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| Outline of Final Research Achievements |
This research developed a nano-rheometry technique to clarify the application properties of materials used for painting and coating, such as gels and pastes, based on the relationship between the macroscopic rheological properties measured by a rheometer and the microscopic properties measured by a nanoindentation test. The spherical nanoindentation test method used in this study was able to capture differences in the microscopic rheological properties of emulsions with sub-micron oil droplet diameters, which could not be evaluated using the recently developed AFM method, due to differences in the lamellar structure of the oil droplets.
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| Free Research Field |
流体工学，レオロジー
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| Academic Significance and Societal Importance of the Research Achievements |
塗布・コーティングで用いられる試料の多くは濃厚粒子分散系であり分散粒子（固体粒子・油滴など）の大きさはサブミクロンから数十ミクロン程度である．粒子間相互作用やクラスター構造の強度など微視的な力学特性を知るには局所的にこれらの粒子に変移を与えて応答を調べる必要があるが近年開発されつつあるAFMを用いた手法では粒子が大きすぎて対応出来なかった．本研究で開発した球状ナノインデンテーション試験とJKR理論の適用によりこれらの試料の新たな特性を見いだすことが可能となった．これにより，新たなナノ・レオメトリー手法として期待できる手法であることを実証した．
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