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Nanofriction on Sodium Polystyrene Sulfonate Brushes in Water

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arxiv 1402.4565 v1 pith:SJJTE5SB submitted 2014-02-19 cond-mat.soft

Takuya Fujima , Eitaro Futakuchi , Fumihiro Kino This is my paper · ORCID
classification cond-mat.soft
keywords brushesfrictionalforcewaterchainsfrictionlowernapss
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We investigated the frictional properties of sodium polystyrene sulfonate (NaPSS) brushes in water by frictional force microscopy (FFM). Polyelectrolyte brushes were prepared on silicon wafers by the grafting-to method. The brushes considerably reduce the frictional force and coefficient of kinetic friction compared to hydrodynamic lubrication on a smooth Si wafer. Frictional force is independent of sliding speed, but is lower for lower degrees of NaPSS polymerization. Nanoindentation tests indicate that the polymer chains in a brush are stretched strongly away from the substrate. These results suggest that polymer chains point support the FFM probe tip in water and reduced contact area and friction.

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  1. Size Effect of Monovalent Ions on Polyelectrolyte Brushes

    cond-mat.soft 2026-07 conditional novelty 5.0 of 10

    Smaller monovalent counterions strengthen low-salt PE-brush collapse; smaller co-ions and joint size reduction suppress high-salt collapse and produce non-classical scaling, including reentrant swelling.

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