Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: S1.00022 : Molecular dynamics simulations of interactions and friction between bottle-brush layers
Author:
Experiments on tethered polyelectrolyte bottle-brush-like
macromolecules
consisting of glycoproteins display fascinatingly low friction
properties of
biological tissues such as cartilage. To understand the role of the
electrostatic interactions in lubricating properties of brush
layers we have
performed MD simulations of charged and neutral bottle-brush
macromolecules
tethered to substrates. In the case of charged bottle-brush
layers the
compression force per unit area $F$ between two brush layers in
salt-free
solutions increases with decreasing the distance $D$ between
substrates as
$F\propto D^{-2}$. A stronger dependence of the compression force
$F$ on the
surface separation $D$ was observed for neutral bottle-brushes,
$F\propto
D^{-4.7}$, in the same interval of compression forces. This strong
dependence of the compression force $F$ on the distance $D$ is
due to excluded
volume interactions between monomers belonging to two overlapping
bottle-brush layers. The weaker dependence observed in
polyelectrolyte
bottle-brushes is due to interaction between counterion clouds
surrounding
the bottle-brush layers. The charged bottle-brush layers have
lower friction
coefficient than neutral layers at the same interval of the
compression and
shear forces.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.S1.22
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