Leakiness of Pinned Neighboring Surface Nanobubbles
Induced by Strong Gas–Surface Interaction
Shantanu Maheshwari
Martin van der Hoef
Javier Rodrı́guez Rodrı́guez
Detlef Lohse
10.1021/acsnano.7b08614.s001
https://acs.figshare.com/articles/media/Leakiness_of_Pinned_Neighboring_Surface_Nanobubbles_Induced_by_Strong_Gas_Surface_Interaction/5901571
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 <i>along</i> 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.
2018-02-13 00:00:00
LJ
diffusion equation-based stability analysis
surface nanobubbles
MD
Neighboring Surface Nanobubbles Induced