Interactions Between Charged Spheres in Divalent Counterion Solution
| Autor: | Philip Pincus, Niels Grønbech-Jensen, Keith M. Beardmore |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1999 |
| Předmět: |
Statistics and Probability
Phase transition Materials science FOS: Physical sciences 02 engineering and technology Condensed Matter - Soft Condensed Matter 01 natural sciences Colloid 0103 physical sciences Statistical physics 010306 general physics Condensed Matter - Statistical Mechanics Complex fluid chemistry.chemical_classification Range (particle radiation) Quantitative Biology::Biomolecules Statistical Mechanics (cond-mat.stat-mech) Pair distribution function Computational Physics (physics.comp-ph) 021001 nanoscience & nanotechnology Condensed Matter Physics Electrostatics Condensed Matter::Soft Condensed Matter chemistry Chemical physics Soft Condensed Matter (cond-mat.soft) SPHERES Counterion 0210 nano-technology Physics - Computational Physics |
| Popis: | We simulate model systems of charged spherical particles in their counterion solution and measure the thermodynamic pressure and the pair distribution function from which we derive effective potentials of mean force. For a system with only electrostatic and hard core interactions, we investigate the effective potential between two like-charged spheres in divalent counterion solution as a function of concentration. We find a strong attractive interaction for high concentration and a global repulsive effective interaction for dilute systems. The results indicate a first order phase transition in sphere-counterion density as a function of global concentration and the effective sphere-sphere potentials in the dilute (solvated) regime suggest significant density fluctuations due to short range local minima in the effective energy surface. Our results arise from a minimal approach model of several recent experiments on polystyrene latex particles in monovalent counterion solution. 10 pages, 4 figures |
| Databáze: | OpenAIRE |
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