Interaction modes between asymmetrically and oppositely charged rods

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

doi:10.1103/PhysRevE.93.022602

Interaction modes between asymmetrically and oppositely charged rods

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

Soft Materials Modelling

Yale University

Research output: Contribution to journal › Article › Scientific › peer-review

7 Citations (Scopus)

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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.

Original language	English
Article number	022602
Journal	Physical Review E
Volume	93
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevE.93.022602
Publication status	Published - 2016
MoE publication type	A1 Journal article-refereed

Keywords

colloidal particles
electrostatic interactions
rodlike polyelectrolytes

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10.1103/PhysRevE.93.022602

Antila_VanTassel_Sammalkorpi_PhysRevE.93Final published version, 439 KB

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AB - 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.

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Interaction modes between asymmetrically and oppositely charged rods

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Keywords

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