Non-linear Osmotic Brush Regime: Experiments, Simulations and Scaling Theory

Details Non-linear Osmotic Brush Regime: Experiments, Simulations and Scaling Theory Non-linear Osmotic Brush Regime: Experiments, Simulations and Scaling Theory

2005-04-18

arxiv.org/abs/cond-mat/0504440v1

J. Phys. Chem. B 108, 16870 (2004)

Physics

Condensed Matter

Soft Condensed Matter

18 pages, 6 figures

Scientific paper

We experimentally and theoretically consider highly condensed planar brushes made of charged polymers. Using x-ray reflectivity on polyelectrolytes which are anchored at the water-air interface, it is shown that such strongly stretched brushes show a slight but detectable height variation upon lateral compression. This stands in contrast to the well-accepted scaling relation in the so-called osmotic brush regime, which predicts the brush height to be independent of the grafting density. Similar effects are seen in simulations on highly compressed charged brushes. Scaling arguments which go beyond the linear approximation for the entropy of confined counterions and for weak chain-stretching are able to explain those findings on a semi-quantitative level.

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