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Hydrostatic pressure effect on micro air bubbles deposited on surfaces with a retreating tip
So Hung Huynh1, Jingming Wang, Yang Yu
1Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University , Clayton, Victoria 3800, Australia.
Langmuir : the ACS Journal of Surfaces and Colloids
|May 10, 2014
Summary
Hydrostatic pressure controls air bubble size on PDMS and silicone surfaces. Increased pressure reduces bubble volume by decreasing height and contact width, offering potential technological applications.
Area of Science:
- Materials Science
- Fluid Dynamics
- Surface Science
Background:
- Controlling micro-bubble formation is crucial for various applications.
- Understanding the influence of external forces on bubble dynamics is essential.
Purpose of the Study:
- To investigate the effect of hydrostatic pressure on air bubble formation and deposition.
- To analyze bubble dimensions and stability on different microstructured surfaces.
Main Methods:
- Air bubbles (6 μL) were formed using a stainless steel tip (2 mm diameter) on PDMS and silicone surfaces.
- Tip retraction speed was maintained at 1 mm/s.
- Hydrostatic pressure was varied, with dimensional analysis confirming fluid inertial forces comparable to surface tension forces.
Main Results:
- Bubble volume decreased with increasing hydrostatic pressure (>20 mm H2O).
- Bubble height significantly reduced with pressure, impacting overall volume.
- Bubble contact width varied between PDMS (invariant) and silicone (initially reducing).
- Increased pressure restricted bubble growth during injection on silicone surfaces.
Conclusions:
- Hydrostatic pressure is an effective parameter for controlling deposited micro-bubble size.
- Surface properties (PDMS vs. silicone) influence bubble behavior under pressure.
- Findings suggest potential for natural phenomena and technological applications in bubble manipulation.
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