Ion trapping on silica nanoparticles: Effect on the ζ-potential

We propose a model to interpret the concentration dependence of the ζ-potential of a suspension of silica nanoparticles of spherical shape in an electrolytic solution. The model is based on the numerical solution of Poisson-Boltzmann equation, in spherical geometry, taking into account the ionic ads...

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Veröffentlicht in:Journal of applied physics 2017-10, Vol.122 (16)
Hauptverfasser: Batalioto, F., Figueiredo Neto, A. M., Barbero, G.
Format: Artikel
Sprache:eng
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Zusammenfassung:We propose a model to interpret the concentration dependence of the ζ-potential of a suspension of silica nanoparticles of spherical shape in an electrolytic solution. The model is based on the numerical solution of Poisson-Boltzmann equation, in spherical geometry, taking into account the ionic adsorption from the nanoparticles. The kinetic equation used for the description is a generalization of the Langmuir's isotherm, modified to take into account the saturation of the adsorption phenomenon. A good agreement between the theoretical model and the experimental data is found. The model allows the determination of adsorption/desorption parameters of the nanoparticles.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4994639