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Surface nanobubble stability is achieved through contact line pinning on patterned surfaces when gas concentration is oversaturated. Dissolution exhibits stick-jump behavior under undersaturation.

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Area of Science:

  • Surface science
  • Nanotechnology
  • Fluid dynamics

Background:

  • Surface nanobubbles are crucial in various applications.
  • Understanding their stability and dynamics is key for controlling interfacial phenomena.

Purpose of the Study:

  • To investigate the stability and dissolution of single surface nanobubbles.
  • To explore the role of chemically patterned surfaces and gas concentration.

Main Methods:

  • Molecular dynamics simulations using Lennard-Jones particles.
  • Simulations of binary mixtures on chemically patterned surfaces.
  • Equilibrium simulations at varying gas oversaturation levels.

Main Results:

  • Contact line pinning on patterned surfaces enables nanobubble stability under gas oversaturation.
  • The equilibrium contact angle follows sin θe = ζL/Lc.
  • Nanobubble dissolution under undersaturation displays 'stick-jump' behavior of the contact line.

Conclusions:

  • Chemically patterned surfaces provide a mechanism for stabilizing surface nanobubbles.
  • Gas oversaturation and contact line pinning are critical for nanobubble stability.
  • The dissolution dynamics are characterized by stick-jump phenomena.