Leakiness of Pinned Neighboring Surface Nanobubbles Induced by Strong Gas-Surface Interaction

Shantanu Maheshwari, Martin van der Hoef, Javier Rodrĺguez Rodrĺguez, Detlef Lohse* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

17 Citations (Scopus)
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Abstract

The stability of two neighboring surface nanobubbles on a chemically heterogeneous surface is studied by molecular dynamics (MD) simulations of binary mixtures consisting of Lennard-Jones (LJ) particles. A diffusion equation-based stability analysis suggests that two nanobubbles sitting next to each other remain stable, provided the contact line is pinned, and that their radii of curvature are equal. However, many experimental observations seem to suggest some long-term kind of ripening or shrinking of the surface nanobubbles. In our MD simulations we find that the growth/dissolution of the nanobubbles can occur due to the transfer of gas particles from one nanobubble to another along the solid substrate. That is, if the interaction between the gas and the solid is strong enough, the solid-liquid interface can allow for the existence of a "tunnel" which connects the liquid-gas interfaces of the two nanobubbles to destabilize the system. The crucial role of the gas-solid interaction energy is a nanoscopic element that hitherto has not been considered in any macroscopic theory of surface nanobubbles and may help to explain experimental observations of the long-term ripening.

Original languageEnglish
Pages (from-to)2603-2609
Number of pages7
JournalACS nano
Volume12
Issue number3
DOIs
Publication statusPublished - 27 Mar 2018

Keywords

  • UT-Hybrid-D
  • Molecular dynamics
  • Multiple surface nanobubbles
  • Pinning
  • Stability
  • Gas-solid interaction
  • pinning
  • gas-solid interaction
  • multiple surface nanobubbles
  • molecular dynamics
  • stability

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