Mechanistic Insights into Nanobubble Merging Studied Using In Situ Liquid-Phase Electron Microscopy,Langmuir

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Mechanistic Insights into Nanobubble Merging Studied Using In Situ Liquid-Phase Electron Microscopy
Langmuir ( IF 3.7 ) Pub Date : 2021-01-05 , DOI: 10.1021/acs.langmuir.0c03208
Sarthak Nag _{1,

2} , Yoko Tomo ₁ , Koji Takahashi _{2,

3} , Masamichi Kohno _{1,

2}

Affiliation

Nanobubbles have attracted great interest in recent times because of their application in water treatment, surface cleaning, and targeted drug delivery, yet the challenge remains to gain thorough understanding of their unique behavior and dynamics for their utilization in numerous potential applications. In this work, we have used a liquid-phase electron microscopy technique to gain insights into the quasistatic merging of surface nanobubbles. The electron beam environment was controlled in order to suppress any new nucleation and slow down the merging process. The transmission electron microscopy study reveals that merging of closely positioned surface nanobubbles is initiated by gradual localized changes in the physical properties of the region between the adjoining nanobubble boundary. The observed phenomenon is then analyzed and discussed based on the different perceptions: localized liquid density gradient and bridge formation for gas exchange. In this study, it is estimated that the merging of the stable nanobubbles is initiated by the formation of a thin gas layer. This work not only enhances our understanding of the merging process of stable surface nanobubbles but will also lead to exploration of new domains for nanobubble applications.

中文翻译：

使用原位液相电子显微镜研究纳米气泡合并的机理研究。

纳米气泡由于其在水处理，表面清洁和靶向药物输送中的应用，近年来引起了极大的兴趣，然而，要获得对它们的独特行为和动力学的透彻了解以用于众多潜在应用中，仍然是一个挑战。在这项工作中，我们使用了液相电子显微镜技术来深入了解表面纳米气泡的准静态合并。控制电子束环境是为了抑制任何新的形核并减慢合并过程。透射电子显微镜研究表明，紧密定位的表面纳米气泡的合并是由相邻纳米气泡边界之间区域的物理性质的逐渐局部变化引发的。然后根据不同的看法对观察到的现象进行分析和讨论：局部液体密度梯度和用于气体交换的桥形成。在这项研究中，据估计，稳定的纳米气泡的合并是由薄气体层的形成引发的。这项工作不仅增进了我们对稳定表面纳米气泡合并过程的理解，而且还将导致探索纳米气泡应用的新领域。

更新日期：2021-01-19

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