On the elasticity of a single polyelectrolyte chain

Details On the elasticity of a single polyelectrolyte chain On the elasticity of a single polyelectrolyte chain

1997-07-23

arxiv.org/abs/cond-mat/9707240v1

Physics

Condensed Matter

Statistical Mechanics

to be published in J. de Phys. II

Scientific paper

10.1051/jp2:1997186

This paper discusses the elastic behavior of a single polyelectrolyte chain. A simple scaling analysis as in self avoiding walk chains are not possible, because three interplaying relevant length scales are involved, i.e., the Debye screening length and the Pincus blob size. Therefore a selfconsistent computation of an effective variational propagator is employed. It is shown that the elastic force f is proportional to the end to end distance R for small f. For larger forces we find a new regime, characterized by deformations larger than a computed electrostatic "blob size". These results are supported by simulations and intuitive physical arguments.

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