TY - JOUR
T1 - Unexpected solid shear response of liquid-like nanoconfined water films and the effect on friction
AU - Zhao, Yang
AU - Bao, Luyao
AU - Fan, Xiaoli
AU - Zhou, Feng
N1 - Publisher Copyright:
© 2024 Elsevier Ltd
PY - 2024/11
Y1 - 2024/11
N2 - Here we find the general and abnormal stick-slip friction of nanoconfined water by extensive molecular dynamics simulations. Specifically, water films exhibit general stick-slip behavior when confined below 1 nm, independent of the water phase, surface wettability, and solid lattice structure. However, at confinement distances of 0.7 and 0.9 nm water films are in liquid-like states, which contradicts the common belief that only solid-like lubricant films can produce stick-slip friction. This unexpected behavior is attributed to the nature of short-time-scale ordered but long-time-scale disordered. Further, we reveal the velocity dependence of friction, which is mainly linear at > = 1 nm, logarithmic at 0.8–0.9 nm, and plateau-like at 0.6–0.7 nm, and give theoretical descriptions by extending the Kramer's theory of activated processes.
AB - Here we find the general and abnormal stick-slip friction of nanoconfined water by extensive molecular dynamics simulations. Specifically, water films exhibit general stick-slip behavior when confined below 1 nm, independent of the water phase, surface wettability, and solid lattice structure. However, at confinement distances of 0.7 and 0.9 nm water films are in liquid-like states, which contradicts the common belief that only solid-like lubricant films can produce stick-slip friction. This unexpected behavior is attributed to the nature of short-time-scale ordered but long-time-scale disordered. Further, we reveal the velocity dependence of friction, which is mainly linear at > = 1 nm, logarithmic at 0.8–0.9 nm, and plateau-like at 0.6–0.7 nm, and give theoretical descriptions by extending the Kramer's theory of activated processes.
KW - Friction
KW - Nanoconfined water
KW - Shear thinning
KW - Stick-slip friction
UR - http://www.scopus.com/inward/record.url?scp=85199387606&partnerID=8YFLogxK
U2 - 10.1016/j.triboint.2024.109994
DO - 10.1016/j.triboint.2024.109994
M3 - 文章
AN - SCOPUS:85199387606
SN - 0301-679X
VL - 199
JO - Tribology International
JF - Tribology International
M1 - 109994
ER -