Frictional forces in polyelectrolyte brushes: effects of sliding velocity, solvent quality and salt

被引：36

作者：

Goujon, Florent ^{[1
]}

Ghoufi, Aziz ^{[2
]}

Malfreyt, Patrice ^{[1
]}

Tildesley, Dominic J. ^{[3
]}

机构：

[1] Univ Clermont Ferrand, Clermont Univ, Lab Thermodynam & Interact Mol, CNRS,UMR 6272,LTIM, F-63000 Clermont Ferrand, France

[2] CNRS, UMR 6251, Inst Phys Rennes, F-35042 Rennes, France

[3] Unilever Res, Port Sunlight, Wirral CH63 3JW, Merseyside, England

来源：

SOFT MATTER | 2012年 / 8卷 / 17期

关键词：

DISSIPATIVE PARTICLE DYNAMICS; CHARGED POLYMER BRUSHES; SHEAR FORCES; LUBRICATION PROPERTIES; MESOSCOPIC SIMULATION; BRUSHLIKE COPOLYMER; FIELD THEORY; COMPRESSION; SURFACE; REGIME;

D O I：

10.1039/c2sm07450h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report dissipative particle dynamics (DPD) simulations of grafted polymer brushes under shear at three separation distances. We investigate the impact of the shear on single monolayers and compressed bilayers formed by neutral and charged polymer chains. The dependence of the friction on the solvent quality is studied for different charge fractions in two compressed polymer brushes. The change in the frictional forces upon the addition of the salt is analyzed in terms of change in the interpenetration coefficient. We complete this study by a description of the brush structure including ordering, composition, tilt and local electroneutrality at different separation distances, salt concentrations, charge fractions and shear rates. Interestingly, some heterogeneities in the monomer density profiles of polyelectrolyte brushes appear under shear and vanish upon addition of salt.

引用

页码：4635 / 4644

页数：10

共 28 条

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