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- W1981835577 abstract "We consider the ζ-potential and the effective charge of spherical polyelectrolyte brushes (SPBs) in aqueous solution in the presence of trivalent europium ions. The SPB consists of a polystyrene core of ca. 250 nm diameter onto which long chains of the strong polyelectrolyte poly(styrene sulfonate) are grafted (contour length: 82 nm). At low concentration of EuCl3 the chains are stretched to nearly full length. If the concentration of the trivalent ions is raised, the surface layer of the polyelectrolyte chains collapses. The ζ-potential of the SPB is calculated from the electrophoretic mobilities measured at different concentrations of EuCl3. At the collapse, ζ decreases by the partial neutralization of the charges by the trivalent ions. The experimental ζ-potential thus obtained agrees with the theoretical surface potential Ψtheo calculated for the effective shear plane by a variational free energy model of the SPB." @default.
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- W1981835577 date "2009-10-01" @default.
- W1981835577 modified "2023-09-24" @default.
- W1981835577 title "Surface potential of spherical polyelectrolyte brushes in the presence of trivalent counterions" @default.
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- W1981835577 doi "https://doi.org/10.1016/j.jcis.2009.06.029" @default.
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