| Project/Area Number |
20J13061
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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 | 国内 |
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| Review Section |
Basic Section 19020:Thermal engineering-related
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| Research Institution | Kyushu University |
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Principal Investigator |
NAG SARTHAK 九州大学, 工学府, 特別研究員(DC2)
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| Project Period (FY) |
2020-04-24 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2021: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2020: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | nanobubbles / liquid cell / TEM / nucleation / interfacial behavior / surface nanobubbles / electron microscopy / phase change / in-situ observation |
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| Outline of Research at the Start |
Bubbles and droplets exhibit exceptional phenomenon at nanoscale. To apprehend them at nanoscale, in-situ liquid cell electron microscopy is used. Nucleation parameters along with the effect of external quantitative properties are investigated to extend our insight on the novel nanoscale phenomena.
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| Outline of Annual Research Achievements |
In summary, we used the liquid phase electron microscopy (LPEM) technique to study the surface nanobubbles and their interfacial behaviour. We devised a three-step gas nanobubble nucleation strategy using electron beam of the TEM, which helps in the on-demand nanobubble nucleation with high probability. Moreover, the electron beam parameters can be tuned to nucleate nanobubbles having different sizes and nucleation number density. In addition, we studied the interactions between two nanobubbles at high spatial resolution. Our results demonstrated that the nanobubbles can exist with and without contact line pinning. Moreover, we captured anisotropic depinning in surface nanobubbles and revealed the role of asymmetric gas distribution on pinning of surface nanobubbles. We also found that the bubble merging is strongly pinned nanobubbles is initiated by the localized region-wise gas film formation. We then proposed a plausible mechanism indicating the formation of a high-gas molecule dense region between the nanobubbles. These findings not only provide insights into the dynamic nanobubble behaviour, but also reiterates the novel applications these nanobubbles can be used for.
In addition, we also worked on the fabrication of graphene nano-scrolls with water encapsulations for its observation in TEM. We explained the dynamics of annular liquid layer adhered to the wall of graphene nano-scrolls by considering the effect of van der Waals interaction.
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| Research Progress Status |
令和3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3年度が最終年度であるため、記入しない。
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