Equilibrium electrostatic effects on the behavior of polyions in solution: polyion-mobile ion interaction

✍ Scribed by Donald L. Ermak; Yin Yeh

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 583 KB
• Volume: 24
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(74)85442-4

✦ Synopsis

The effects of the polyion-mobile ion electrostatic interaction on the dynamic behavior of the polyions is qualitatively determined for dilute polyelectrolytic solutions at thermodynamic equilibrium. We describe the motion of the polyions using a modified form of the Iangevin equation to include the effects of the electrostatic field. The polyion diffusion coefficient is shown to be increased by this interaction and rough calculations indicate that this increase may be significant (=lOc/o). A computer simulation technique, similar to the moIecuIar dynamics method, is proposed for a quantitative study of this effecr.

1. lntraductian

The electrostatic interactions between the various charged particles in polyelectrolytic solutions have generally been recognized to be the source of much non-ideaiity. The effects of these-interactions on the diffusion and