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Aggregation Stability of SiO2, FeOOH, ZrO2, CeO2, and Natural Diamond Sols and Their Binary Mixtures: 2. The Photometric Study of Heterocoagulation of SiO2–FeOOH, SiO2–ZrO2, SiO2–CeO2, and CeO2–Natural Diamond Binary Systems in KCl Solutions

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Abstract

The aggregation stability of 1 : 1 and 3 : 1 (by volume) binary mixtures of two hydrophobic (SiO2–FeOOH), one hydrophobic and one hydrophilic (SiO2–ZrO2, SiO2–CeO2), and two hydrophilic (CeO2–natural diamond) sols was studied by photometry over a wide range of KCl concentrations at pH ≈ 6 and 3. The stability of the mixed binary sols was determined by the stability of the sol with a predominant particle number concentration. In the SiO2–FeOOH system, the phenomenon of heteroadagulation stabilization was caused by the electrostatic factor of the stability of adsorbed SiO2 particles and, in the SiO2–ZrO2 system, by the structural factor of the stability of adsorbed hydrophilic ZrO2 particles. The stability of binary mixtures containing one or two hydrophobic components is qualitatively explained in terms of the Derjaguin theory of heterocoagulation of hydrophobic colloids. The stability of the binary system of two hydrophilic components (CeO2–natural diamond) is determined by the structural component of the interaction energy of particles.

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  1. Russian Research Center Vavilov State Optical Institute, ul. Babushkina 36, St. Petersburg, 193171, Russia

    E. V. Golikova, N. M. Burdina & N. A. Vysokovskaya

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  1. E. V. Golikova
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  2. N. M. Burdina
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  3. N. A. Vysokovskaya
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Golikova, E.V., Burdina, N.M. & Vysokovskaya, N.A. Aggregation Stability of SiO2, FeOOH, ZrO2, CeO2, and Natural Diamond Sols and Their Binary Mixtures: 2. The Photometric Study of Heterocoagulation of SiO2–FeOOH, SiO2–ZrO2, SiO2–CeO2, and CeO2–Natural Diamond Binary Systems in KCl Solutions. Colloid Journal 64, 142–148 (2002). https://doi.org/10.1023/A:1015236507606

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