Comment on ``Adsorption of Polyelectrolyte onto a Colloid of Opposite Charge''

Details Comment on ``Adsorption of Polyelectrolyte onto a Colloid of Opposite Charge'' Comment on ``Adsorption of Polyelectrolyte onto a Colloid of Opposite Charge''

1999-01-18

arxiv.org/abs/cond-mat/9901152v2

Phys. Rev. Lett. 83, 2473 (1999)

Physics

Condensed Matter

Soft Condensed Matter

A comment on: E. Gurovitch and P. Sens, Phys. Rev. Lett. 82, 339 (1999)

Scientific paper

10.1103/PhysRevLett.83.2473

In a recent Letter, Gurovitch and Sens studied the adsorption of a weakly charged polyelectrolyte chain onto an oppositely charged colloidal particle. By using a variational technique they found that the colloidal particle can adsorb a polymer of higher charge than its own, and thus be ``overcharged.'' I argue that the observed overcharging by a factor of 16/5 is indeed an artifact of the approximations involved in the study. Moreover, I show that the existence of overcharging depends crucially on the choice of the trial wave function, contrary to their claim.

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