NANOTRIBOLOGY Feb. 28, 2006 Warren Courtney

Reasons to study nanotribology To clarify our understanding of macroscopic friction effects Estimated saving >$100 billion year in N. America if improvements in machinery wear can be reduced Reduction in use of energy and materials if friction can be reduced To understand the friction and wear of magnetic storage devices if target of 1 terabit/6.5 cm 2 density and fast download is to be achievable

Device for scanning tip tribology Scanning tip usually Si 3 N 4, or Natural Diamond

RETURN TO TOMLINSON MODEL Scan of friction loop generated by a scanning tip moving over a sodium chloride crystal

Difference in Nanoscale measurement where tip size affects the coefficient of friction as opposed to cof being a property of two surfaces Figure 1: Effect of tip sizes on friction.

EFFECTS OF SURFACE CONTACT

REFERENCES grove.ufl.edu/~wgsawyer/MURI/MURI.html Bhuushan, B. Handbook of micro/Nano tribology CRC Press, studies.html