Repulsive and attractive depletion forces mediated by nonadsorbing polyelectrolytes in the Donnan limit
Jasper Landman,
Max P. M. Schelling,
Remco Tuinier
et al.
Abstract:In mixtures of colloids and nonadsorbing polyelectrolytes, a Donnan potential arises across the region between surfaces that are depleted of polyelectrolyte and the rest of the system. This Donnan potential tends to shift the polyelectrolyte density profile towards the colloidal surface and leads to local accumulation of polyelectrolytes. We derive a zero-field theory for the disjoining pressure between two parallel flat plates. Polyelectrolyte is allowed to enter the confined interplate region at the cost of … Show more
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