Charged Semi-Permeable Shell with Encapsulated Polyions: Concentration Profile, Surface Potential, and Electrostatic Pressureстатья
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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.
Аннотация:We study theoretically the electrostatic equilibrium for a charged shell
filled with a suspension of polyions (e.g., colloids, polyelectrolytes, etc.) and
immersed in an infinite salt-free reservoir. The shell is impermeable for polyions,
but allows free diffusion of counterions. From the solution of the linearized
Poisson-Boltzmann equation we obtain the distribution of the potential and concentration
profiles for polyions. We then derive explicit formulas for the electrostatic
pressure exerted by the shell. If the overall charge of the filled shell has the same sign
as the surface alone the pressure on the shell increases with increase of the surface
charge density. Otherwise the surface charge density suppresses the electro-osmotic
pressure due to the electrostatic attraction between the oppositely charged polyions
and shell.