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液中TEM技術によるナノスケール沸騰現象の直接観測

使用液体 TEM 技术直接观察纳米级沸腾现象

基本信息

批准号：
20J13061
负责人：
NAG SARTHAK
金额：
$ 1.47万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2020
资助国家：
日本
起止时间：
2020-04-24 至 2022-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-20J13061/
关键词：
nanobubbles liquid cell TEM nucleation interfacial behavior surface nanobubbles electron microscopy phase change in-situ observation

项目摘要

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.

综上所述，我们利用液相电子显微镜（LPEM）技术研究了表面纳米气泡及其界面行为。利用透射电镜电子束设计了一种三步成核策略，可实现高概率的按需成核。此外，电子束参数可以调整成核纳米气泡具有不同的尺寸和成核数密度。此外，我们还在高空间分辨率下研究了两个纳米气泡之间的相互作用。结果表明，在接触线钉扎和不钉扎的情况下，纳米气泡都可以存在。此外，我们还捕获了表面纳米气泡的各向异性脱钉，揭示了不对称气体分布对表面纳米气泡钉住的作用。我们还发现气泡合并是强钉住的，纳米气泡是由局部区域方向的气膜形成引发的。然后，我们提出了一个合理的机制，表明在纳米气泡之间形成了一个高气体分子密集区域。这些发现不仅提供了对纳米气泡动态行为的见解，而且重申了这些纳米气泡可以用于的新应用。此外，我们还研究了水包覆石墨烯纳米卷轴的制备及其在TEM中的观察。考虑到范德华相互作用的影响，我们解释了石墨烯纳米卷轴壁上的环状液体层的动力学。