Force balance in systems of spherical polyelectrolytes
| Autor: | Peter Colonomos, Donald A. McQuarrie, Bruce Enos |
|---|---|
| Rok vydání: | 1975 |
| Předmět: |
Chemistry
Hamaker constant Thermodynamics Interaction energy Electrostatics Dissociation (chemistry) Polyelectrolyte Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials symbols.namesake Colloid and Surface Chemistry Classical mechanics Ionic strength symbols SPHERES van der Waals force |
| Zdroj: | Journal of Colloid and Interface Science. 52:289-298 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/0021-9797(75)90202-7 |
| Popis: | Equilibrium separation distances in a model system composed of two spherical polyions is analyzed as a function of the pH and ionic strength of the bathing solution. The separations are determined graphically as a force balance between electrostatic repulsion and van der Waals attraction. From basic input such as the surface density of ionizable groups and the corresponding dissociation characteristics of these groups, a self-consistent functional of the potential is developed from which the electrostatic repulsive force may be obtained. For the van der Waals attractive force, the Hamaker functional form for the interaction energy between spheres is used with a Hamaker constant chosen by fitting the asymptotic form of the Hamaker expression to a more rigorous form based on the Lifshitz theory. It is found that the general behavior of the sphere-sphere system as a function of the pH and ionic strength of the bathing solution closely parallels that for systems of parallel cylindrical polyions. |
| Databáze: | OpenAIRE |
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