Abstract
The entropic repulsion between strongly overlapping electrical double-layers from two parallel amphoteric plates is described via the Donnan equilibrium in the limit of zero electric field. The plates feature charge-regulation and the inter-plate solution is in equilibrium with a reservoir of a monovalent electrolyte solution. A finite electric potential and disjoining pressure is found at contact between the plates, due to a complete discharging of the plates. For low potentials, the decay of potential and pressure is fully governed by a characteristic length scale and the contact potential. Additionally, for large separations we find a universal inverse square decay of disjoining pressure, irrespective of the contact potential. The results of the Donnan theory show quantitative agreement with self-consistent field computations that solve the full Poisson equation.
| Original language | English |
|---|---|
| Pages (from-to) | 4702-4710 |
| Number of pages | 9 |
| Journal | Soft Matter |
| Volume | 14 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - 21 Jun 2018 |
Funding
M. V. and R. T. would like to thank Prof. Frans Leermakers for providing the SFbox software package. M. V. acknowledges the Netherlands Organisation for Scientific Research (NWO) for a Veni grant (no. 722.017.005). The authors would like to thank Landman et al.16 for sharing a preprint of their manuscript.
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