T. Coffey et al., A scanning probe and quartz crystal microbalance study of the impact of C-60 on friction at solid-liquid interfaces, J PHYS-COND, 13(21), 2001, pp. 4991-4999
We have investigated the changes in interfacial friction of toluene on mica
and Ag(111) both in the presence and in the absence of interfacial C-60 la
yers employing atomic force microscope (AFM) and quartz crystal microbalanc
e (QCM) techniques. The lateral force measurements fail to detect C-60 at t
he toluene/mica interface, presumably because the C-60 is dislodged by the
slow-moving probe tip. In contrast, QCM measurements of interfacial frictio
n and slippage for toluene/Ag(111) are sensitive to the presence of interfa
cial C-60 We see the friction double when C-60 is present. The results are
discussed in the light of the full-slip boundary condition which had been p
reviously reported for surface forces apparatus (SFA) measurements on tolue
ne/mica in the presence and absence of interfacial C-60.