Repulsive and attractive depletion forces mediated by nonadsorbing polyelectrolytes in the Donnan limit

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Samenvatting

In mixtures of colloids and nonadsorbing polyelectrolytes, a Donnan potential arises across the region between surfaces that are depleted of the polyelectrolyte and the rest of the system. This Donnan potential tends to shift the polyelectrolyte density profile toward the colloidal surface and leads to the local accumulation of polyelectrolytes. We derive a zero-field theory for the disjoining pressure between two parallel flat plates. The polyelectrolyte is allowed to enter the confined interplate region at the cost of a conformational free energy penalty. The resulting disjoining pressure shows a crossover to a repulsive regime when the interplate separation gets smaller than the size of the polyelectrolyte chain, followed by an attractive part. We find a quantitative match between the model and self-consistent field computations that take into account the full Poisson-Boltzmann electrostatics.

Originele taal-2Engels
Artikelnummer164904
Aantal pagina's14
TijdschriftJournal of Chemical Physics
Volume154
Nummer van het tijdschrift16
DOI's
StatusGepubliceerd - 28 apr 2021

Bibliografische nota

Publisher Copyright:
© 2021 Author(s).

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

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