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The effect of pH on aggregation kinetics of monodisperse silica sol in naCl solutions

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Abstract

The aggregation kinetics of monodisperse silica sols with a particle size of 220 nm in aqueous NaCl solutions is studied by flow ultramicroscopy in a pH range of 2.0–10.2. Slow coagulation of the sols is found to occur via the barrierless mechanism in the secondary potential minimum resulting from the summation of dispersion attractive and structural repulsive forces. The influence of pH and NaCl concentration on the parameters of the structural component of the energy of the interaction between SiO2 particles is demonstrated.

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Authors and Affiliations

  1. St. Petersburg State University, Universitetskii, pr. 26, Staryi Peterhof, St. Petersburg, 198504, Russia

    N. A. Novikova & E. V. Golikova

  2. St. Petersburg State Technical University of Plant Polymers, ul. Ivana Chernykh 4, St. Petersburg, 198095, Russia

    Yu. M. Chernoberezhskii

  3. St. Petersburg State Technical University, ul. Politekhnicheskaya 29, St. Petersburg, 195251, Russia

    L. M. Molodkina

Authors
  1. N. A. Novikova
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  2. E. V. Golikova
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  3. Yu. M. Chernoberezhskii
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  4. L. M. Molodkina
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Additional information

Original Russian Text © N.A. Novikova, E.V. Golikova, Yu.M. Chernoberezhskii, L.M. Molodkina, 2014, published in Kolloidnyi Zhurnal, 2014, Vol. 76, No. 1, pp. 72–82.

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Novikova, N.A., Golikova, E.V., Chernoberezhskii, Y.M. et al. The effect of pH on aggregation kinetics of monodisperse silica sol in naCl solutions. Colloid J 76, 66–75 (2014). https://doi.org/10.1134/S1061933X13060124

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  • DOI: https://doi.org/10.1134/S1061933X13060124

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