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@ARTICLE{DeBeer:138058,
author = {De Beer, Sissi and Müser, Martin},
title = {{A}lternative dissipation mechanisms and the effect of the
solvent in friction between polymer brushes on rough
surfaces},
journal = {Soft matter},
volume = {9},
number = {30},
issn = {1744-6848},
address = {Cambridge},
publisher = {Royal Society of Chemistry (RSC)},
reportid = {FZJ-2013-04326},
pages = {7234 - 7241},
year = {2013},
abstract = {Surfaces covered with end-anchored polymers under good
solvent conditions have excellent tribological properties.
The friction between such surfaces is commonly attributed to
steady-state interdigitation of the opposing polymer
brushes. However, this conclusion tends to be based on
idealized geometries neglecting surface roughness. Using
molecular dynamics simulations, we find that there are
qualitative differences between the friction of rough and
flat polymer-brush surfaces. For rough surfaces the
dissipation due to transient interdigitation and capillary-
and shape-hysteresis is just as important or can even
dominate over steady-state interdigitation. Having a mix of
dissipation mechanisms that are all intertwined affects the
observed friction force in linear-response as well as in the
shear-thinning exponents and effective viscosity. Moreover,
we find that the effect of the solvent viscosity is
sublinear.},
cin = {JSC},
ddc = {530},
cid = {I:(DE-Juel1)JSC-20090406},
pnm = {411 - Computational Science and Mathematical Methods
(POF2-411)},
pid = {G:(DE-HGF)POF2-411},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000321662600003},
doi = {10.1039/c3sm50491c},
url = {https://juser.fz-juelich.de/record/138058},
}