Nucleation and Growth of a Nanobubble on Rough Surfaces

Area of Science:

• Surface science
• Nanotechnology
• Physical chemistry

Background:

• Nanobubbles form via heterogeneous reactions producing gas molecules.
• Surface roughness influences nanobubble nucleation and growth dynamics.

Purpose of the Study:

• Investigate nanobubble nucleation and growth on rough surfaces.
• Determine the impact of surface roughness and reaction rates on nanobubble behavior.

Main Methods:

• Molecular dynamics simulations were employed.
• Simulations were conducted at varying reaction rates and surface morphologies.

Main Results:

• Nanobubble growth followed a t^1/3 power law post-nucleation, transitioning to a t^1/2 diffusive regime.
• This growth pattern was independent of surface roughness and reaction rates within the studied range.
• Gas oversaturation required for nucleation was quantified and shown to depend on surface morphology.

Conclusions:

• Surface roughness and reaction rates do not significantly alter the fundamental growth kinetics of nanobubbles.
• Surface morphology plays a crucial role in determining the gas oversaturation threshold for nanobubble nucleation.