Repulsive and attractive depletion forces mediated by nonadsorbing polyelectrolytes in the Donnan limit
| Autor: | Mark Vis, Jasper Landman, M. P. M. Schelling, Remco Tuinier |
|---|---|
| Přispěvatelé: | Physical Chemistry, Soft Matter and Biological Physics, Institute for Complex Molecular Systems, Colloidal Soft Matter, ICMS Core |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Donnan potential
Quantitative Biology::Biomolecules Materials science Physics and Physical Chemistry of Foods Field (physics) Disjoining pressure General Physics and Astronomy FOS: Physical sciences Condensed Matter - Soft Condensed Matter Electrostatics Polyelectrolyte Condensed Matter::Soft Condensed Matter Colloid symbols.namesake Chemical physics symbols Life Science Soft Condensed Matter (cond-mat.soft) Limit (mathematics) Physical and Theoretical Chemistry VLAG |
| Zdroj: | Journal of Chemical Physics, 154(16) Journal of Chemical Physics, 154(16):164904. American Chemical Society Journal of Chemical Physics 154 (2021) 16 |
| ISSN: | 1089-7690 0021-9606 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|