Distinguishing elastic shear deformation from friction on the surfaces of molecular crystals.
Elastic deformation on the surfaces of molecular crystals can be imaged using a variant of lateral force microscopy in which the tip is scanned parallel to the cantilever axis. The shear force transverse to this direction has a distinctly different origin than the friction force as determined by the tip velocity and temperature dependence of the cantilever torque. An elastic deformation model for the tip-sample interaction predicts the crystallographic anisotropy of the transverse shear contrast, establishing its connection with the relative magnitude of the in-plane elastic tensor components.
Kalihari
Vivek
V
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis 55455, USA.
Haugstad
Greg
G
Frisbie
C Daniel
CD