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RAS Chemistry & Material ScienceКоллоидный журнал Colloid Journal

  • ISSN (Print) 0023-2912
  • ISSN (Online) 3034-543X

STUDY OF MECHANISM OF STRUCTURE FORMATION IN AQUEOUS DISPERSIONS OF Na+-SMECTITES

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PII
S3034543XS0023291225020054-1
DOI
10.7868/S3034543X25020054
Publication type
Article
Status
Published
Authors
B. V. Pokidko
  • Affiliation:
O. A. Dulina
  • Affiliation:
Volume/ Edition
Volume 87 / Issue number 2
Pages
128-141
Abstract
Present paper contains the results of an experimental study of the colloidal structures and rheology of aqueous dispersions of Na+-montmorillonite, which were obtained by capillary and rotational viscometry methods. Aqueous dispersions of clay colloids undergo significant structural changes, accompanied by great change in the type of the flow. All these changes are managed by alteration in indifferent electrolyte concentration within a narrow concentration range. Certain critical concentration was found to appear near about 3 mM NaCl concentration for the series of dispersions with 0.25-3.0 wt% solid content. This concentration point is significantly lower than the coagulation thresholds known from the experimental and theoretical works in this field. Existence of such a critical region may reflects both processes of formation/disruption of aggregates and change in the mechanism of either aggregation or structure formation. The obtained rheological data were compared with theoretical calculations and the results of dispersion analysis (by DLS method) of aqueous dispersions which might make a bit development in the field of colloid structure investigation of smectite dispersions.
Keywords
смектиты структурообразование реология монтмориллонит дисперсии агрегация ДЭС золи гели
Date of publication
13.01.2025
Year of publication
2025
Number of purchasers
0
Views
23

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