TY - JOUR
T1 - Leakiness of Pinned Neighboring Surface Nanobubbles Induced by Strong Gas-Surface Interaction
AU - Maheshwari, Shantanu
AU - van der Hoef, Martin
AU - Rodrĺguez Rodrĺguez, Javier
AU - Lohse, Detlef
N1 - ACS deal
PY - 2018/3/27
Y1 - 2018/3/27
N2 - 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.
AB - 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.
KW - UT-Hybrid-D
KW - Molecular dynamics
KW - Multiple surface nanobubbles
KW - Pinning
KW - Stability
KW - Gas-solid interaction
KW - pinning
KW - gas-solid interaction
KW - multiple surface nanobubbles
KW - molecular dynamics
KW - stability
UR - http://www.scopus.com/inward/record.url?scp=85043978961&partnerID=8YFLogxK
U2 - 10.1021/acsnano.7b08614
DO - 10.1021/acsnano.7b08614
M3 - Article
AN - SCOPUS:85043978961
SN - 1936-0851
VL - 12
SP - 2603
EP - 2609
JO - ACS nano
JF - ACS nano
IS - 3
ER -