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Related Experiment Video

Updated: Nov 22, 2025

Studying Dynamic Processes of Nano-sized Objects in Liquid using Scanning Transmission Electron Microscopy
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Mechanistic Insights into Nanobubble Merging Studied Using In Situ Liquid-Phase Electron Microscopy.

Sarthak Nag1,2, Yoko Tomo1, Koji Takahashi3,2

  • 1Department of Mechanical Engineering, Kyushu University, Fukuoka 819-0395, Japan.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 5, 2021
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Summary

Researchers studied surface nanobubble merging using liquid-phase electron microscopy. They found merging begins with localized property changes and a thin gas layer, advancing nanobubble application understanding.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Surface Science

Background:

  • Surface nanobubbles are of significant interest for applications like water treatment and drug delivery.
  • Understanding nanobubble dynamics, particularly merging, is crucial for optimizing their use.
  • Current knowledge of nanobubble merging mechanisms remains incomplete.

Purpose of the Study:

  • To investigate the quasistatic merging process of surface nanobubbles.
  • To elucidate the initial mechanisms driving nanobubble coalescence.
  • To enhance the fundamental understanding of nanobubble behavior.

Main Methods:

  • Utilized liquid-phase transmission electron microscopy (LP-TEM).
  • Controlled the electron beam environment to prevent new nucleation and slow merging.
  • Observed nanobubble interactions at the nanoscale.

Main Results:

  • Merging initiates through gradual, localized changes in the physical properties between nanobubbles.
  • Evidence suggests a thin gas layer formation precedes stable nanobubble merging.
  • Analyzed merging via localized liquid density gradients and gas exchange bridges.

Conclusions:

  • The study provides novel insights into the merging dynamics of surface nanobubbles.
  • Identified key initial steps in the nanobubble merging process.
  • Findings pave the way for new applications leveraging controlled nanobubble interactions.