Density functional theory for a macroion suspension

Details Density functional theory for a macroion suspension Density functional theory for a macroion suspension

2005-06-21

arxiv.org/abs/cond-mat/0506537v1

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 8 figures, RevTeX 4.0

Scientific paper

A density functional theory for a macroion suspension is examined, where the excess free energy corresponds to the macroion self energy arising from the polarisation of the supporting electrolyte solution. This is treated within a linearised or Debye-Huckel approximation. The model predicts liquid-liquid phase separation at low ionic strength. The interface structure and surface tension between coexisting phases is calculated using a variational approximation. Results are also obtained for structure factors, which are shown to obey the Stillinger-Lovett moment conditions. As one approaches the critical points, the structure factors may diverge at a non-zero wavevector, indicating that the critical points could be replaced by charge-density-wave phases.

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