Velocity dependence of friction and hydrogen bonding effects.
We show that the friction force varies with the sliding velocity in a manner that depends on the chemical nature of the interface. Surfaces terminated with the hydrogen acceptor and donor moieties capable of forming H-bond networks exhibit a friction that decreases with sliding velocity, a behavior that is opposite to that of surfaces where no such networks can form. We explain the results with a model where the domains of glassy H-bond networks are disrupted at a critical applied stress leading to slippage.
Chen
Jinyu
J
Materials Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley California 94720, USA.
Ratera
Imma
I
Park
Jeong Young
JY
Salmeron
Miquel
M