Abstract
Aqueous solutions of charged spherical macroions with variable dielectric permittivity and their associated counterions are examined within the cell model using a field theory and Monte Carlo simulations. The field theory is based on separation of fields into short- and long-wavelength terms, which are subjected to different statistical-mechanical treatments. The simulations were performed by using a new, accurate, and fast algorithm for numerical evaluation of the electrostatic polarization interaction. The field theory provides counterion distributions outside a macroion in good agreement with the simulation results over the full range from weak to strong electrostatic coupling. A low-dielectric macroion leads to a displacement of the counterions away from the macroion.
Original language | English |
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Article number | 224508 |
Number of pages | 10 |
Journal | Journal of Chemical Physics |
Volume | 135 |
Issue number | 22 |
DOIs | |
Publication status | Published - 14 Dec 2011 |
Keywords
- electric double layer
- spherical double layer
- Poisson-Boltzmann
- electrolyte solution
- charged colloids
- image charges
- ions
- potentials