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Interfacial Thermal Fluctuations Stabilize Bulk Nanobubbles.

Yuyu Chen1, Yue Hu1, Benlong Wang1,2

  • 1Department of Engineering Mechanics, School of Ocean and Civil Engineering, <a href="https://ror.org/0220qvk04">Shanghai Jiao Tong University</a>, Shanghai 200240, China.

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|September 20, 2024
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Summary
This summary is machine-generated.

Nanobubble stability is explained by a new model showing thermal fluctuations reduce surface tension, allowing bubbles to stabilize at a finite size. This model extends nanobubble contraction times significantly beyond classical predictions.

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Area of Science:

  • Physical Chemistry
  • Nanotechnology
  • Fluid Dynamics

Background:

  • The long-term stability of nanobubbles remains a subject of debate, despite indirect evidence suggesting their longevity.
  • Understanding nanobubble stability is crucial for various applications, including drug delivery and materials science.

Purpose of the Study:

  • To develop a theoretical model for nanobubble evolution and stability.
  • To investigate the role of thermal fluctuations in nanobubble stabilization.

Main Methods:

  • Incorporation of thermal capillary wave theory into a nanobubble evolution model.
  • Analysis of the relationship between thermal fluctuation intensity and bubble curvature.

Main Results:

  • The model demonstrates that dense nanobubbles shrink and intensify interfacial thermal fluctuations.
  • Reduced surface tension due to thermal fluctuations neutralizes Laplace pressure, leading to stabilization at a finite size.
  • A stability criterion was identified: thermal fluctuation intensity scales superlinearly with curvature (sqrt[⟨h^{2}⟩]∝(1/R)^{n}, n>1).

Conclusions:

  • The developed model significantly extends the predicted time frame for nanobubble contraction (by 2 orders of magnitude).
  • The model accurately predicts equilibrium radii for nanobubbles within the experimentally observed range (90-215 nm).
  • This work provides a theoretical framework for understanding and predicting nanobubble stability.