Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2007-01-31
Physical Review E 75, 011401 (2007).
Physics
Condensed Matter
Soft Condensed Matter
Scientific paper
10.1103/PhysRevE.75.011401
Our interest goes to the different virial contributions to the equation of state of charged colloidal suspensions. Neglect of surface effects in the computation of the colloidal virial term leads to spurious and paradoxical results. This pitfall is one of the several facets of the danger of a naive implementation of the so called One Component Model, where the micro-ionic degrees of freedom are integrated out to only keep in the description the mesoscopic (colloidal) degrees of freedom. On the other hand, due incorporation of wall induced forces dissolves the paradox brought forth in the naive approach, provides a consistent description, and confirms that for salt-free systems, the colloidal contribution to the pressure is dominated by the micro-ionic one. Much emphasis is put on the no salt case but the situation with added electrolyte is also discussed.
Belloni Luigi
Castaneda-Priego Ramon
Dobnikar Jure
Trizac Emmanuel
von Grunberg Hans Hennig
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