Interaction modes between asymmetrically and oppositely charged rods

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Researchers

Research units

  • Yale University

Abstract

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.

Details

Original languageEnglish
Article number022602
JournalPhysical Review E
Volume93
Issue number2
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

    Research areas

  • colloidal particles, electrostatic interactions, rodlike polyelectrolytes

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