Study of mechanism of structure formation in aqueous dispersions of NA+-smectites

Мұқаба
  • Авторлар: Pokidko B.V.1, Dulina O.A.2
  • Мекемелер:
    1. Институт геологии рудных месторождений, петрографии, минералогии и геохимии Российской академии наук
    2. МИРЭА – Российский технологический университет, кафедра наноразмерных систем и поверхностных явлений
  • Шығарылым: Том 87, № 2 (2025)
  • Беттер: 128-141
  • Бөлім: Articles
  • ##submission.dateSubmitted##: 06.07.2025
  • ##submission.dateAccepted##: 06.07.2025
  • ##submission.datePublished##: 06.07.2025
  • URL: https://clinpractice.ru/0023-2912/article/view/686803
  • DOI: https://doi.org/10.31857/S0023291225020054
  • EDN: https://elibrary.ru/tpbvdj
  • ID: 686803

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

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.

Толық мәтін

Рұқсат жабық

Авторлар туралы

B. Pokidko

Институт геологии рудных месторождений, петрографии, минералогии и геохимии Российской академии наук

Хат алмасуға жауапты Автор.
Email: pokidko2000@mail.ru
Ресей, Москва

O. Dulina

МИРЭА – Российский технологический университет, кафедра наноразмерных систем и поверхностных явлений

Email: pokidko2000@mail.ru
Ресей, Москва

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Қосымша файлдар

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Әрекет
1. JATS XML
Жүктеу
2. Fig. 1. Idealized types of structures in aqueous dispersions of montmorillonite (according to [1], see explanation in text).

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3. Fig. 2. Phase diagrams of aqueous dispersions of Na+-MMT. a – Na+-MMT isolated from Swy-2 bentonite (Source Clay Minerals Repository), curves 1–4 – sol-gel transition values ​​obtained using the concentration dependences of viscosity, osmotic pressure and birefringence ([6]), b – Na+-MMT isolated from Wyoming M40A bentonite (Sud Chemie AG), black and white circles – points corresponding to the results of rheological measurements, limiting different regions of the dispersion state [7], c – Na+-MMT isolated from Volclay bentonite (Sud Chemie AG) (pH = 9.7), circles and triangles – points corresponding to the results of rheological measurements, limiting different regions of the dispersion state [8].

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4. Fig. 3. Model for describing the structure of primary particles in aqueous dispersions of smectites (see notation in text).

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5. Fig. 4. RCD curves in aqueous 0.1% montmorillonite dispersions with NaCl concentration (mM; 0.1; 1, 3 and 5 mM).

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6. Fig. 5. Dependences of relative viscosity on NaCl concentration for smectite dispersions. a – sample Na+-fr-1, particle content (wt. %). 1 – 0.25, 2 – 0.5, 3 – 1.0, 4 – 1.5 and 5–2.0. b – sample Na+-fr-2, particle content 2.7%.

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7. Fig. 6. Dependence of relative viscosity on particle concentration (sample Na+-fr-1) at different NaCl concentrations (mM). 1 – 1.0, 2 – 1.5, 3 – 2.0, 4 – 3.0, 5 – 5.0, 6 – 7.0, 7 – 10.0

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8. Fig. 7. Flow curves of 3.0% aqueous dispersions of Na+-smectite (sample Na+-fr-1), with different NaCl content (mM): 1 – 3.0, 2 – 3.5, 3 – 4.0, 4 – 7.0, 5 – 8.0, 6 – 10.0.

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9. Fig. 8. Flow curves of 3.0% aqueous dispersions of Na+-smectite (sample Na+-fr-1) under conditions of structure destruction and restoration. NaCl concentration (mM): 1, 2 – 3.0, 3, 4 – 10.0. Curves 1, 3 – CS mode, ascending branch, curves 2, 4 – CR mode – descending branch.

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10. Fig. 9. a – dependence of the viscosity of 2.7% dispersions (Na+-fr-2) on the shear stress at different NaCl concentrations (mM): 1 – 3.1; 2 – 3.2; 3 – 3.5; 4 – 3.8, 5 – 4.3; 6 – 5.0. b – dependence of the plastic viscosity of 2.7% dispersions on the NaCl concentration

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11. Fig. 10. a – dependence of viscosity on Na+ concentration in 1.9% dispersions (sample Na+-fr-1). Curve 1 – NaCl addition, curve 2 – NaOH addition. pH for [NaOH] = 2, 3, 5, 7 and 10 mM were 7.6, 8.3, 10.7, 11.4 and 11.7, respectively. b – dependence of pH of 2.7% dispersions on NaCl content

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