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Related Concept Videos

Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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Related Experiment Video

Updated: Oct 15, 2025

Production of Membrane-Filtered Phase-Shift Decafluorobutane Nanodroplets from Preformed Microbubbles
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From Bubbles to Nanobubbles.

George Z Kyzas1, Athanasios C Mitropoulos1

  • 1Department of Chemistry, International Hellenic University, GR 65404 Kavala, Greece.

Nanomaterials (Basel, Switzerland)
|October 23, 2021
PubMed
Summary

This study explores stabilizing mobile bulk nanobubbles (bNBs) using Brownian motion. A fractal walk may maintain bNB size, offering insights into their elusive nature and longevity.

Area of Science:

  • Physics
  • Surface Science
  • Nanotechnology

Background:

  • Nanobubbles exist as immobile surface nanobubbles (sNBs) and mobile bulk nanobubbles (bNBs).
  • The existence of sNBs is experimentally confirmed, while bNBs remain debated despite strong evidence.
  • The stability and longevity of nanobubbles, particularly bNBs, are not well understood.

Purpose of the Study:

  • To investigate the potential for stabilizing bulk nanobubbles (bNBs).
  • To explore the role of Brownian motion in maintaining bNB stability.
  • To determine if specific fractal walk conditions can preserve bNB size.

Main Methods:

  • Theoretical exploration of nanobubble dynamics.
  • Modeling nanobubble behavior using fractal walk concepts.
Keywords:
dispersed-airdissolved-aireffluentselectroflotationparticleswastewaters

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  • Analysis of conditions for invariant bubble size.

    • Main Results:

    • A fractal walk, under specific conditions, demonstrates the potential to keep the size of a bulk nanobubble invariant.
    • This suggests a possible mechanism for stabilizing mobile nanobubbles.

    Conclusions:

    • Brownian motion, specifically through fractal walks, may offer a pathway to stabilize bulk nanobubbles.
    • Further research is needed to confirm the existence and stability mechanisms of bNBs.