Effect of Disjoining Pressure on Surface Nanobubbles
Vitaly B Svetovoy1,2, Ivan Dević1, Jacco H Snoeijer1,3
1Physics of Fluids Group, Department of Science and Technology and MESA+ Institute for Nanotechnology, and JM Burgers Center for Fluid Dynamics, University of Twente , P.O. Box 217, 7500 AE Enschede, The Netherlands.
Surface nanobubbles are stabilized by pressure balance. Disjoining pressure from van der Waals forces influences nanobubble shape and limits their aspect ratio, impacting their properties.
Area of Science:
- Physical Chemistry
- Surface Science
- Nanotechnology
Background:
- Stable surface nanobubbles exist in gas-oversaturated solutions.
- Their stability relies on a balance between Laplace pressure and gas overpressure.
- The pinning of the contact line is crucial for nanobubble stability.
Purpose of the Study:
- To analyze the effect of disjoining pressure on surface nanobubble properties.
- To investigate the influence of van der Waals interactions on nanobubble shape and size.
- To understand how gas compressibility affects nanobubble characteristics.
Main Methods:
- Functional minimization of Gibbs free energy.
- Sharp-interface approximation.
- Analysis of van der Waals potential and gas compressibility effects.
Main Results:
- The disjoining pressure, arising from van der Waals interactions, affects nanobubble properties.
- Nanobubble shape slightly deviates from the classical spherical-cap model but remains similar.
- Disjoining pressure imposes a restriction on the nanobubble aspect ratio (size/height).
Conclusions:
- Disjoining pressure plays a significant role in determining surface nanobubble characteristics.
- A maximal aspect ratio for nanobubbles is derived, dependent on the Young contact angle.
- The study provides insights into the physics governing nanobubble formation and stability.
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