The paper investigates the effects of surface stiffness on the slip process
aiming to obtain a better insight of the momentum transfer at nanoscale. The
surface stiffness is modeled through the stiffness, kappa, of spring potentials,
which are employed to construct the thermal walls. It is shown that variations
of stiffness, kappa, influence the slip mechanism either toward slip or stick
conditions. Increasing the values of kappa alters the oscillation frequency and
the mean displacement of the wall particles toward higher and lower values,
respectively. Our results suggest that the amount of slip produced as a function
of stiffness follows a common pattern that can be modeled through a fifth-order
polynomial function.