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Effect of an Atomic Scale Protrusion on a Tip Surface on Molecular Stick-Slip Motion and Friction Anisotropy in Friction Force Microscopy

Takuya Ohzono,Masamichi Fujihira

Anisotropy
Slip (aerodynamics)
Atomic force microscopy
2001
A molecular dynamics (MD) method is used to simulate the molecular stick-slip motion and the friction anisotropy observed experimentally between an atomic force microscope (AFM) tip and an ordered monolayer of n-alkane chains which tilt in one of six equivalent stable directions. A slider with a single atomic scale protrusion, connected to an external force control unit via three orthogonal springs, is used to model the AFM tip apex with cantilever springs under feedback regulation of the applied normal force. Although there is almost no interfacial commensurability between the tip atomic lattice and the sample molecular lattice, molecular lattice-resolved images are observed due to molecular scale stick-slip motion when the size of the protrusion is comparable to the molecular lattice constant. The present MD simulation can provide an explanation of why we can see a molecular lattice in contact AFM.
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    Effect of an Atomic Scale Protrusion on a Tip Surface on Molecular Stick-Slip Motion and Friction Anisotropy in Friction Force Microscopy” is a paper by Takuya Ohzono Masamichi Fujihira published in 2001. It has an Open Access status of “closed”. You can read and download a PDF Full Text of this paper here.