Interaction modes between asymmetrically and oppositely charged rods

Hanne S. Antila, Paul R. Van Tassel, Maria Sammalkorpi

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
234 Downloads (Pure)


The interaction of oppositely and asymmetrically charged rods in salt - a simple model of (bio)macromolecular assembly - is observed via simulation to exhibit two free energy minima, separated by a repulsive barrier. In contrast to similar minima in the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, the governing mechanism includes electrostatic attraction at large separation, osmotic repulsion at close range, and depletion attraction near contact. A model accounting for ion condensation and excluded volume is shown to be superior to a mean-field treatment in predicting the effect of charge asymmetry on the free-energy profile.

Original languageEnglish
Article number022602
JournalPhysical Review E
Issue number2
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed


  • colloidal particles
  • electrostatic interactions
  • rodlike polyelectrolytes


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