Rheological behaviour of aqueous montmorillonite dispersions from the tagansky deposit

The article considers results of rheological studies of dilute aqueous dispersions of montmorillonite near the sol-gel transition. Results of dynamic light scattering, rotational viscometry, and adsorption data reveal the presence of a critical concentration of the structure formation, which is stro...

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书目详细资料
Main Authors: B. V. Pokidko, M. Yu. Pletnev, M. M. Melnikova
格式: 文件
语言:Russian
出版: MIREA - Russian Technological University 2011-12-01
丛编:Тонкие химические технологии
主题:
在线阅读:https://www.finechem-mirea.ru/jour/article/view/1199
实物特征
总结:The article considers results of rheological studies of dilute aqueous dispersions of montmorillonite near the sol-gel transition. Results of dynamic light scattering, rotational viscometry, and adsorption data reveal the presence of a critical concentration of the structure formation, which is strongly influenced by the electrolyte (NaCl) concentration in the dispersion. Bentonite dispersion behaves differently with respect to the NaCl content near the critical concentration just before and after it. When we have a smaller particle concentration in the dispersion, extreme dependence of the strength and viscosity characteristics on the NaCl concentration is evident, while monotonic dependence exists at high particle concentration up to attaining the maximal value of the gel tensile strength. The critical concentration obtained from viscometry data is close to the theoretical value obtained for the simplified model in the approximation of hard spheres.
ISSN:2410-6593
2686-7575