Formation of surface nanobubbles on nanostructured substrates

Area of Science:

• Materials Science
• Surface Science
• Nanotechnology

Background:

• Nanoscale gas bubbles at solid/liquid interfaces are of significant research interest.
• Surface properties critically influence nanobubble formation and stability.
• Understanding nanobubble behavior is key for applications in various fields.

Purpose of the Study:

• To experimentally and numerically investigate nanobubble formation on nanostructured substrates.
• To explore the role of patterned hydrophobic and hydrophilic domains in nanobubble nucleation and stability.
• To demonstrate control over nanobubble characteristics via surface nanopatterning.

Main Methods:

• Fabrication of nanotrenched and nanoporous surfaces using electron beam lithography.
• Atomic force microscopy (AFM) for imaging nanobubble formation and location.
• Molecular dynamics (MD) simulations to support experimental findings.

Main Results:

• Nanobubbles selectively formed on hydrophobic domains, avoiding hydrophilic areas.
• Nanobubble size and contact angle decreased with smaller hydrophobic domains.
• Nanopattern dimensions (size and period of confinement) controlled nanobubble formation and stability.

Conclusions:

• Surface nanopatterning provides a method to control nanobubble nucleation and stability.
• The findings enhance understanding of surface feature effects on nanobubbles/nanodroplets.
• This work is valuable for designing surfaces with tailored nanobubble properties.