Frictional behavior of micro-patterned silicon surface
2015 (English)In: Journal of colloid and interface science, Vol. 456, 76-84 p.Article in journal (Refereed) Published
A micro-patterned silicon surface, consisting of depressions with walls having a tilt angle of 30°, was created by photolithography followed by etching. The friction forces in single asperity contact acting between such a surface and an AFM tip was measured in air. This allowed elucidation of the validity of some common friction rules for this particular situation where a small tip traces a surface having roughness features that are significantly larger than the tip itself. The rules that was compared with our data were Amontons' first rule of friction stating that the friction force should be proportional to the load; Amontons' third rule stating that the friction force should be independent of sliding speed, and Euler's rule providing a relation between slope angle and friction coefficient. We found that both nanoscale surface heterogeneities and the mum-sized depressions affect friction forces, and considerable reproducible variations were found along a particular scan line. Nevertheless Amontons' first rule described average friction forces well. Amontons' third rule and Euler's rule were found to be less applicable to our system.
Place, publisher, year, edition, pages
2015. Vol. 456, 76-84 p.
IdentifiersURN: urn:nbn:se:kth:diva-171092DOI: 10.1016/j.jcis.2015.06.009ISI: 000358458500010PubMedID: 26093236ScopusID: 2-s2.0-84934895458OAI: oai:DiVA.org:kth-171092DiVA: diva2:842486
FunderSwedish Research Council
QC 201507202015-07-202015-07-202015-08-27Bibliographically approved