Volume 64, Number 3, November 2003
|Page(s)||413 - 419|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 November 2003|
Interactions between polyelectrolyte-macroion complexes
Sektion Physik, LMU - Theresienstr. 37, 80333 München, Germany
Accepted: 20 August 2003
We consider structures formed by one semiflexible polyelectrolyte (PE) and one oppositely charged sphere and calculate the interaction between two such complexes within the ground-state approximation, where the PE assumes its optimal configuration. Using parameters appropriate for DNA-histone systems, we find the second virial coefficient of inter-complex interactions to be negative for intermediate salt concentrations within the range where stable complexes are formed, in agreement with experiments. A simple screened monopole-dipole model reproduces these findings.
PACS: 87.15.-v – Biomolecules: structure and physical properties / 82.70.-y – Disperse systems; complex fluids / 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling
© EDP Sciences, 2003
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