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Mechanism of the Decrease in Surface Tension by Bulk Nanobubbles (Ultrafine Bubbles).

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Nanotechnology

Background:

  • Bulk nanobubbles (ultrafine bubbles) are known to reduce the surface tension of water.
  • The exact mechanism behind this phenomenon, particularly concerning the bubble's interaction with the liquid surface, requires further elucidation.

Purpose of the Study:

  • To theoretically investigate the mechanism responsible for the decrease in surface tension caused by bulk nanobubbles in water.
  • To evaluate the role of nanobubble adsorption at the liquid surface and their structural properties in surface tension reduction.

Main Methods:

  • Numerical simulations based on the dynamic equilibrium model for bulk nanobubble stability.
  • Analysis of nanobubble adsorption at the liquid-gas interface.
  • Comparison of theoretical predictions with experimental data from the Tuziuti experiment and freeze-thaw processes.

Main Results:

  • Bulk nanobubble concentration in water decreases over time due to adsorption at the liquid surface.
  • The Janus-like structure of nanobubbles, with significant hydrophobic surface coverage, contributes to breaking water's hydrogen bond network, reducing surface tension.
  • Theoretical estimations align with experimental observations of surface tension decrease attributed to nanobubbles.

Conclusions:

  • The decrease in water surface tension by bulk nanobubbles is significantly influenced by nanobubble adsorption and their unique Janus-like structure.
  • This mechanism offers an alternative explanation to the electric charge stabilization model, especially in solutions with hydrophobic impurities.
  • Impurities from the nanobubble generator may also contribute to the observed surface tension reduction.