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Investigating Interfacial Effects on Surface Nanobubbles without Pinning Using Molecular Dynamics Simulation
Yi-Xian Chen1,2, Yeng-Long Chen1,2,3, Tsu-Hsu Yen4
1Institute of Physics , Academia Sinica , Sec. 2, 128 Academia Road , Taipei 11529 , Taiwan , ROC.
Langmuir : the ACS Journal of Surfaces and Colloids
|November 28, 2018
Summary
Stable aqueous argon surface nanobubbles form on hydrophobic surfaces without pinning sites, challenging prior research. Key factors include gas adsorption, substrate interactions, and bulk gas concentration.
Area of Science:
- Physical Chemistry
- Surface Science
- Nanotechnology
Background:
- Aqueous surface nanobubbles are crucial in various scientific fields.
- Understanding nanobubble stability is essential for predicting their behavior and applications.
- Previous studies suggested surface pinning sites are necessary for nanobubble stability.
Purpose of the Study:
- To investigate the stability of aqueous argon surface nanobubbles on hydrophobic surfaces.
- To determine the influence of gas adsorption, solid-gas interaction energy, and bulk gas concentration on nanobubble stability.
- To challenge the prevailing notion that three-phase pinning sites are required for nanobubble stability.
Main Methods:
- Molecular dynamics simulations were employed.
- The SPC/E water model was used for the aqueous solvent.
- Simulations were conducted to observe nanobubble behavior over extended periods (160 ns).
Main Results:
- Stable aqueous argon surface nanobubbles were observed for over 160 ns without surface pinning sites.
- Substrate hydrophobicity reduces the required bulk gas oversaturation for nanobubble formation.
- A gas enrichment layer, adsorption monolayer, and interfacial water hydrogen bonding appear necessary for stability.
Conclusions:
- Surface nanobubble stability does not inherently require three-phase pinning sites.
- Gas adsorption and interfacial phenomena play critical roles in nanobubble stabilization.
- Hydrophobic surfaces facilitate nanobubble formation by lowering oversaturation requirements.
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