Influence of Indifferent Electrolytes on Formation of Coagulative Structures in Aqueous Silica Dispersions

Authors

  • Olena Goncharuk Chuiko Institute of Surface Chemistry of NAS of Ukraine, Kyiv 03164, Ukraine
  • Lyudmila Andriyko Chuiko Institute of Surface Chemistry of NAS of Ukraine, Kyiv 03164, Ukraine
  • Olena Korotych
  • Andrii Marynin
  • Volodymyr Zarko
  • Anatolii Ukrainets
  • Vladimir Gun’ko
  • Maria Malysheva Department of Chemistry, Taras Shevchenko National University of Kyiv,

DOI:

https://doi.org/10.17721/fujcV5I2P40-48

Keywords:

silica dispersions, indifferent electrolytes, particle size distribution, rheological properties

Abstract

Effects of indifferent electrolytes (NaCl, KCl, LiCl, NaI, NaNO3, CaCl2, and MgCl2) on the electrical double layer (EDL), aggregation, gelling, and rheological properties of aqueous dispersions of nanosilica were investigated. All examined indifferent electrolytes enhance interactions between nanoparticles of fumed silica through the coagulation mechanism. The critical concentration of gelation and gelling time decrease in the presence of the electrolytes, while the effective viscosity of the dispersions and average size of aggregates (Def) increase in series of chlorides: Li+ < Na+ < K+ < Ca2+ < Mg2+. That corresponds to an increase in the cation radius and reduction of the hydration shell. The nature of anions and cations significantly affects the values of Def and viscosity. For sodium salts, the viscosity increases in series I- < NO3- < Cl- corresponding to an increase in the hydration shell.

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Published

2017-12-30

Issue

Vol. 5 No. 2 (2017): Proceedings of the IX International scientific conference “Kyiv-Toulouse”

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