Testing the relevance of effective interaction potentials between highly charged colloids in suspension

J. Dobnikar 1, 2, R. Castañeda-Priego 3, H. H. von Grünberg 2, E. Trizac 4, 5

New Journal of Physics 8 (2006) 277

Combining cell and Jellium model mean-field approaches, Monte Carlo together with integral equation techniques, and finally more demanding many-colloid mean-field computations, we investigate the thermodynamic behavior, pressure and compressibility of highly charged colloidal dispersions, and at a more microscopic level, the force distribution acting on the colloids. The Kirkwood-Buff identity provides a useful probe to challenge the self-consistency of an approximate effective screened Coulomb (Yukawa) potential between colloids. Two effective parameter models are put to the test: cell against renormalized Jellium models.

  • 1. Jozef Stefan Institute,
    Jozef Stefan Institute
  • 2. Institut für Chemie,
    Karl-Franzens-Universität
  • 3. Instituto de Fisica,
    Universidad de Guanajuato
  • 4. Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS),
    CNRS : UMR8626 – Université Paris XI - Paris Sud
  • 5. Center for Theoretical Biological Physics (CTBP),
    University of San Diego