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L. S. Àndriyko, V. I. Zarko, À. I. Ìàrynin, V. V. Olishevskyi, A. A. Kravchenko, and Å. M. Demjanenko
«Zeta Potential and Degree of the Aggregation of Nanoparticles of the Pyrogenic Silica in the Presence of the Dissolved Metal Chlorides in the Aqueous Medium»
389–402 (2015)
PACS numbers: 61.46.Bc, 61.46.Df, 68.35.-p, 73.22.-f, 81.07.Nb, 82.45.Yz, 82.70.Dd
The effects of univalent metals’ chlorides (LiCl, NaCl, KCl) at different concentrations (0.001–0.1 M) on the behaviour of nanosilica (0.5–5 wt.%) in aqueous medium are analysed using photon correlation spectroscopy (particle size distribution—PSD) and electrophoresis (zeta potential, ?). The shift of dissociation constant (Ka) estimated for fumed silica hydroxyl sites is observed. Such a change in the pKa value is established via quantum-chemical study of the electrolyte–silica surface interaction. The correlation dependence associated with pKa, an effective diameter, and ?-potential of silica nanoparticles is demonstrated.
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