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Nanobubbles in Ultrapure Water Can Self-Propel.

Evangelos Bakalis1, Pavlos Efthymiopoulos2, Francesca Lugli1

  • 1Dipartimento di Chimica "G.Ciamician", Universita di Bologna, V. F. Selmi 2, 40126, Bologna, Italy.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|September 4, 2024
PubMed
Summary

Oxygen nanobubbles exhibit self-propelled motion in water, deviating from typical Brownian motion. Their movement is characterized as fractional Brownian motion, with varying diffusion patterns observed.

Keywords:
dynamics of nanobbublesfractional brownian motionoxygen nanobubblesself-propelled nanobubblesultrapure water and nanobubbles

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Area of Science:

  • Physics
  • Colloid Science
  • Nanotechnology

Background:

  • Nanobubbles are sub-micron gas entities with diverse scientific applications.
  • Their movement is typically assumed to follow Brownian motion.

Purpose of the Study:

  • To investigate the motion of oxygen bulk nanobubbles in ultrapure water at body temperature.
  • To characterize the observed motion using fractal analysis and stochastic process descriptors.

Main Methods:

  • Observation of oxygen bulk nanobubble trajectories in ultrapure water.
  • Application of fractal analysis, including structure function, velocity autocorrelation, skewness, and kurtosis calculations.
  • Classification of the observed motion as a stochastic process.

Main Results:

  • Oxygen nanobubbles demonstrate self-propelled motion, not solely Brownian diffusion.
  • The motion exhibits self-affine characteristics with different scaling exponents along the x- and y-axes.
  • Analysis confirms a quasi-Gaussian stochastic process classified as fractional Brownian motion.
  • Superdiffusion is observed in over 50% of x-axis trajectories, and 30% of y-axis trajectories.

Conclusions:

  • Oxygen nanobubbles exhibit self-propelled, fractional Brownian motion in ultrapure water.
  • The motion's characteristics are influenced by the anisotropic nature of the field of view.
  • This finding challenges the conventional understanding of nanobubble diffusion and opens new research avenues.