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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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High temperature and pressure inside a dissolving oxygen nanobubble.

Kyuichi Yasui1, Toru Tuziuti1, Wataru Kanematsu1

  • 1National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Anagahora, Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan.

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|January 29, 2019
PubMed
Summary

Numerical simulations suggest oxygen nanobubbles may form a few hydroxyl (OH) radicals upon dissolution. However, the simulated OH radical production rate is significantly lower than experimental findings.

Keywords:
Bubble dissolution into waterNumerical simulationOH radicalOxygen (O(2)) bubbleWithout dynamic stimuli

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Area of Science:

  • Physical Chemistry
  • Nanoscale Science
  • Computational Fluid Dynamics

Background:

  • Experimental studies suggest hydroxyl (OH) radical formation from oxygen (O2) nanobubbles.
  • Understanding the mechanisms of OH radical generation is crucial for various applications.

Purpose of the Study:

  • To investigate the possibility of OH radical formation during the dissolution of O2 nanobubbles in water using numerical simulations.
  • To compare simulated OH radical production rates with experimental data.

Main Methods:

  • Numerical simulations of O2 nanobubble dissolution in water without external stimuli.
  • Analysis of temperature and pressure conditions within the nanobubble during dissolution.
  • Estimation of OH radical formation based on simulation parameters.

Main Results:

  • O2 nanobubble dissolution is faster than air nanobubbles due to higher O2 solubility.
  • Simulations predict the formation of a few OH radicals per 10^7 bubbles.
  • Internal nanobubble temperature and pressure at dissolution are lower than air nanobubbles.

Conclusions:

  • The simulated OH radical production rate is approximately 13 orders of magnitude lower than experimentally reported values.
  • Current numerical models may not fully capture the mechanism of OH radical formation from O2 nanobubbles.