The effect of ionic size on polyion-small ion distributions in a cylindrical double layer
The structure of an electrolyte surrounding an isolated, cylindrical polyion – the cylindrical double layer – is studied using a density functional approach and the modified Poisson Boltzmann theory. The polyion is modelled as an infinitely long, rigid, and impenetrable charged cylinder, while t...
Saved in:
| Date: | 2005 |
|---|---|
| Main Authors: | , |
| Format: | Article |
| Language: | English |
| Published: |
Інститут фізики конденсованих систем НАН України
2005
|
| Series: | Condensed Matter Physics |
| Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/119656 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | The effect of ionic size on polyion-small ion distributions in a cylindrical double layer / C.N. Patra, L.B. Bhuiyan // Condensed Matter Physics. — 2005. — Т. 8, № 2(42). — С. 425–446. — Бібліогр.: 70 назв. — англ. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Summary: | The structure of an electrolyte surrounding an isolated, cylindrical polyion
– the cylindrical double layer – is studied using a density functional
approach and the modified Poisson Boltzmann theory. The polyion is modelled
as an infinitely long, rigid, and impenetrable charged cylinder, while
the electrolyte consists of rigid ions moving in a dielectric continuum. The
results for the zeta potential, polyion-small ion distribution, and the mean
electrostatic potential are obtained for a wide range of physical conditions
including three different ionic diameters of 2, 3, and 4·10⁻¹⁰ m. The zeta
potentials show a maximum or a minimum with respect to the polyion surface
charge density for a divalent counterion. The polyion-ion distributions
and the mean electrostatic potential profiles show considerable variations
with the concentration of the electrolyte, the valency of the ions constituting
the electrolyte, and the ionic size. The theories are seen to be generally
consistent with each other overall, and are capable of predicting the charge
inversion phenomenon – a feature, which is completely absent in the classical
Poisson-Boltzmann theory. Moreover, the theories reproduce well some
Monte Carlo results (for ion distributions) from the literature. |
|---|