Issue 10, 2013
From the journal:

Soft Matter

The kinetic friction coefficient of neutral and charged polymer brushes†

Florent Goujon,a   Aziz Ghoufi,b   Patrice Malfreyt*a  and  Dominic J. Tildesleya  

* Corresponding authors

a Clermont Université, Université Blaise Pascal, Institut de Chimie de Clermont-Ferrand, ICCF, CNRS, UMR 6296, BP 10448, F-63000 Clermont-Ferrand, France
E-mail: Patrice.Malfreyt@univ-bpclermont.fr
Fax: +33 473 40 53 28
Tel: +33 473407204

b Institut Physique de Rennes, IPR, CNRS, UMR 6251, 263 Avenue Général Leclerc, F-35042 Rennes, France

Abstract

The compression-dependence of the friction coefficients of neutral and charged polymer brushes at the same surface coverage is studied using dissipative particle dynamics (DPD) at two different shear rates. The chemical potential of the solvent particles is kept constant along the compression curve in order to mimic the experimental conditions. We conclude that the kinetic friction coefficient between charged brushes is higher than that of neutral brushes at low compressions and smaller at high compressions. These differences are small. We also show that it is possible to simulate ultra-low friction coefficients comparable with experiments using the smallest shear rate accessible in a mesoscale simulation. The unexpected behavior of the shear deformation-induced structural heterogeneities in charged polymer brushes calls for further experiments to elucidate this local reorganization of the ions in adsorbed charged polymers.

Graphical abstract: The kinetic friction coefficient of neutral and charged polymer brushes

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Article information

DOI
https://doi.org/10.1039/C3SM27641D
Article type
Paper
Submitted
16 Nov 2012
Accepted
14 Jan 2013
First published
04 Feb 2013

Soft Matter, 2013,9, 2966-2972

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The kinetic friction coefficient of neutral and charged polymer brushes

F. Goujon, A. Ghoufi, P. Malfreyt and D. J. Tildesley, Soft Matter, 2013, 9, 2966 DOI: 10.1039/C3SM27641D

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