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Area of Science:

  • Physics
  • Chemistry
  • Materials Science

Background:

  • Gas bubble accumulation on substrates impedes physicochemical processes like water electrolysis.
  • Microbubble detachment occurs via coalescence-induced jumping driven by surface energy release.
  • Nanobubble coalescence is complicated by gas compressibility, hindering surface energy release.

Purpose of the Study:

  • To investigate the detachment mechanism of coalescing surface nanobubbles.
  • To determine if nanobubbles can detach despite gas compressibility effects.
  • To establish a unified driving mechanism for bubble detachment across length scales.

Main Methods:

  • Molecular dynamics simulations.
  • Continuum numerical simulations.
  • Theoretical analysis.

Main Results:

  • Coalescing nanobubbles with large contact angles can detach.
  • Detachment is driven by the release of pressure energy from nanobubble volume expansion.
  • This pressure energy release provides a unified mechanism for bubble detachment.

Conclusions:

  • Gas compressibility does not prevent nanobubble detachment after coalescence.
  • Pressure energy release is the key driver for nanobubble detachment.
  • A unified mechanism explains bubble detachment across micro and nano scales.