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Quantifying interfacial tensions of surface nanobubbles: How far can Young's equation explain?
Hideaki Teshima1,2, Hiroki Kusudo3, Carlos Bistafa3
1Department of Aeronautics and Astronautics, Kyushu University, Nishi-Ku, Motooka 744, Fukuoka 819-0395, Japan. hteshima05@aero.kyushu-u.ac.jp.
Nanoscale
|January 31, 2022
Summary
We quantified interfacial tensions for nanobubbles at solid-liquid interfaces. Young's equation holds, but gas adsorption effects on stability require further investigation beyond van der Waals interactions.
Area of Science:
- Physical Chemistry
- Surface Science
- Nanotechnology
Background:
- Nanobubbles at solid-liquid interfaces are crucial in physicochemical phenomena.
- Understanding nanobubble interfacial tensions is vital but challenging due to limited calculation methods.
Purpose of the Study:
- To quantify liquid-gas, solid-liquid, and solid-gas interfacial tensions of nitrogen nanobubbles at graphite-water interfaces.
- To investigate the validity of Young's equation for nanobubbles and the influence of gas density and size effects.
Main Methods:
- Molecular dynamics (MD) analysis was employed to calculate interfacial tensions.
- Mechanical and thermodynamic insights were utilized for quantification.
Main Results:
- Young's equation was found to hold for nanobubbles across different radii.
- Liquid-gas and solid-liquid interfacial tensions were largely unaffected by internal gas density.
- Solid-gas interfacial tension decreased with increasing gas density due to adsorption, but this effect on contact angle was negligible for radii > 50 nm.
Conclusions:
- Observed nanobubble stability and shape in experiments cannot be solely explained by interfacial tension changes from van der Waals interactions and Young's equation.
- Additional factors beyond gas adsorption are necessary to explain experimental observations of ultradense, non-flat, and stable nanobubbles in MD simulations.
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