Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-08-02
Chapter 9 in Understanding Soft Condensed Matter via Modeling and Computation, Eds. W.-B. Hu and A.-C. Shi (World Scientific,
Physics
Condensed Matter
Soft Condensed Matter
18 pages, 5 figures
Scientific paper
We present an overview of our understanding of electrostatic interactions between charged macromolecular surfaces mediated by mobile counter- and coions. The dichotomy between the weak and the strong coupling regimes is described in detail and the way they engender repulsive and attractive interactions between nominally equally charged macroions. We also introduce the concept of dressed counterions in the case of many-component Coulomb fluids that are partially weakly and partially strongly coupled to local electrostatic fields leading to non-monotonic interactions between equally charged macroions. The effect of quenched surface charge disorder on the counterion-mediated electrostatic interactions is analyzed within the same conceptual framework and shown to lead to unexpected and extraordinary electrostatic interactions between randomly charged surfaces with equal mean surface charge densities or even between effectively neutral macroion surfaces. As a result, these recent developments challenge some cherished notions of pop culture.
Kanduc Matej
Naji Ali
Netz Roland R.
Podgornik Rudolf
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