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Manipulating Trapped Nanobubbles Moving and Coalescing with Surface Nanobubbles
Dayong Li1, Juan Gu2, Yong Li1
1School of Electromechanical and Automotive Engineering, Yantai University, Yantai 264005, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|October 13, 2022
Summary
Trapped nanobubbles form at nanopits, unlike surface nanobubbles on smooth surfaces. Their interconversion and mobility on pitted substrates are influenced by atomic force microscope scan parameters.
Area of Science:
- Nanoscale science
- Surface physics
- Fluid dynamics
Background:
- Surface nanobubbles typically form on smooth surfaces.
- Trapped nanobubbles nucleate at nanopits on pitted substrates.
- Understanding nanobubble behavior is crucial for applications.
Purpose of the Study:
- Investigate the formation and behavior of trapped and surface nanobubbles on a nanopitted substrate.
- Explore the interconversion and mobility of these nanobubbles.
- Determine factors influencing nanobubble dynamics.
Main Methods:
- Utilized tapping-mode atomic force microscopy (AFM) with a temperature difference method.
- Captured and manipulated both trapped and surface nanobubbles.
- Analyzed the effects of scan load and scan area size on nanobubble mobility.
Main Results:
- Demonstrated the nucleation of trapped nanobubbles at nanopits.
- Showcased the mutual transformation between trapped and surface nanobubbles.
- Identified scan load and scan area size as key factors affecting nanobubble mobility.
- Observed the merging of surface nanobubbles into trapped nanobubbles.
Conclusions:
- Trapped and surface nanobubbles share the same chemical nature.
- Provides experimental evidence for nanobubble existence during contact line depinning.
- Offers insights into nanobubble stability and industrial applications.
