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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
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Formation, dissolution and properties of surface nanobubbles.

Zhizhao Che1, Panagiotis E Theodorakis2

  • 1State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China.

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|October 21, 2016
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Summary

Molecular dynamics simulations reveal surface nanobubble formation is driven by air molecule nucleation and coalescence on substrates. These nanobubbles exhibit unique properties like lower surface tension and larger contact angles.

Keywords:
All-atom simulationsContact angleMolecular dynamics simulationsSurface nanobubblesSurface tension

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Nanotechnology

Background:

  • Surface nanobubbles are stable gaseous phases on solid substrates in liquids.
  • Experimental investigation of nanobubble formation, dissolution, structure, and properties remains challenging.

Purpose of the Study:

  • To investigate the formation and dissolution mechanisms of surface nanobubbles using molecular dynamics simulations.
  • To provide insights into the structural properties and physical behavior of nanobubbles.

Main Methods:

  • Atomistic molecular dynamics simulations were performed.
  • Systems included water, air (N2 and O2), and a Highly Oriented Pyrolytic Graphite (HOPG) substrate.

Main Results:

  • Nanobubble formation is initiated by air molecule nucleation and subsequent coalescence on the substrate.
  • Substrate interaction enhances nanobubble stability; bulk nanobubbles are less stable.
  • Calculated nanobubble properties include density, contact angle, and surface tension.

Conclusions:

  • Nanobubbles represent a condensed gaseous phase with surface tension lower than atmospheric conditions.
  • Nanobubbles exhibit larger contact angles compared to equivalent nanodroplets.
  • All-atom simulations offer valuable insights into nanobubble physics, stimulating further research.