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

Goncharuk, Olena; Andriyko, Lyudmila; Korotych, Olena; Marynin, Andrii; Zarko, Volodymyr; Ukrainets, Anatolii; Gun’ko, Vladimir; Malysheva, Maria

doi:10.17721/fujcV5I2P40-48

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

Тип публікації :

Стаття

Дата випуску :

2017

Автор(и) :

Goncharuk, Olena

Andriyko, Lyudmila

Korotych, Olena

Marynin, Andrii

Zarko, Volodymyr

Ukrainets, Anatolii

Gun’ko, Vladimir

Malysheva, Maria

Мова основного тексту :

Англійська

eKNUTSHIR URL :

https://ir.library.knu.ua/handle/15071834/25542

DOI :

10.17721/fujcV5I2P40-48

Журнал :

French-Ukrainian Journal of Chemistry

Том :

5

Випуск :

2

ISSN :

2312-3222

Початкова сторінка :

40

Кінцева сторінка :

48

Цитування :

[APA 7] Goncharuk, O., Andriyko, L., Korotych, O., Marynin, A., Zarko, V., Ukrainets, A., Gun’ko, V., & Malysheva, M. (2017). Influence of Indifferent Electrolytes on Formation of Coagulative Structures in Aqueous Silica Dispersions. French-Ukrainian Journal of Chemistry, 5(2), 40–48. https://doi.org/10.17721/fujcV5I2P40-48

[ДСТУ] Influence of Indifferent Electrolytes on Formation of Coagulative Structures in Aqueous Silica Dispersions / O. Goncharuk et al. French-Ukrainian Journal of Chemistry. 2017. Vol. 5, no. 2. P. 40—48. DOI: 10.17721/fujcV5I2P40-48 (date of access: 25.07.2026).

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.

Ключові слова :

silica dispersions indifferent electrolytes particle size distribution rheological properties

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