| 研究実績の概要 |
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.
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