Counterion desorption and globule-coil transition of a polyelectrolyte under tension

Details Counterion desorption and globule-coil transition of a polyelectrolyte under tension Counterion desorption and globule-coil transition of a polyelectrolyte under tension

2009-05-27

arxiv.org/abs/0905.4524v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 4 figures

Scientific paper

We explore the mechanical response of a single polyelectrolyte chain under tension in good and poor solvents using a combination of simulation and theory. In poor solvents, where the equilibrium state of the chain is a collapsed globule, we find that the chain undergoes a globule-coil transition, as the magnitude of the force is increased beyond a critical value. This transition, where the polymer size changes discontinuously from a small to a large value, is accompanied by release of bound counterions from the chain. We explain these results by adhering to a statistical mechanical theory of counter-ion condensation on flexible polyelectrolytes.

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