Quantitative Measurement of Friction between Single Microspheres by
Friction Force Microscopy
Xing Ling
Hans-Jürgen Butt
Michael Kappl
10.1021/la700408v.s004
https://acs.figshare.com/articles/journal_contribution/Quantitative_Measurement_of_Friction_between_Single_Microspheres_by_Friction_Force_Microscopy/2993881
The sliding friction between single silica microspheres was examined by applying friction force microscopy to probe
the interaction between spherical silica particles glued to a tipless atomic force microscopy (AFM) cantilever and
another particle glued to a glass slide. A three-dimensional model handling the complex contact geometry between
spherical particles was established to compute friction and normal forces at the sliding interface from measured
deflections of the AFM cantilever. Results obtained at different loads show a linear relationship between friction and
normal force, with a friction coefficient of 0.4 between silica spheres. Friction in this system occurs at multi-asperity
contacts. The results show that the macroscopic friction law of Amontons can be used to model the friction behavior
of micrometer-sized granular matter. For plasma-treated silica particles, increased friction as well as wear could be
observed during sliding.
2007-07-31 00:00:00
friction coefficient
Friction Force MicroscopyThe
silica particles
AFM cantilever
model handling
friction force microscopy
results show
silica spheres
glass slide
macroscopic friction law
force microscopy
Quantitative Measurement
loads show
silica microspheres
friction behavior
contact geometry
Single Microspheres