Determining pseudo-equilibrium of montmorillonite colloids in generation and sedimentation experiments as a function of ionic strength, cationic form, and elevation
| Autor: | Sandra García-García, Claude Degueldre, Susanna Wold, Sabrina Frick |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Sodium
digestive oral and skin physiology Inorganic chemistry chemistry.chemical_element Sedimentation Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Colloid Colloid and Surface Chemistry Montmorillonite chemistry Ionic strength Particle-size distribution Cation-exchange capacity Particle |
| Zdroj: | Journal of colloid and interface science. 335(1) |
| ISSN: | 1095-7103 |
| Popis: | Colloid generation and sedimentation experiments were carried out on Na- and Ca-montmorillonite in order to verify whether pseudo-equilibrium concentrations are reached at the same level in both types of experiments. The size and concentration of colloidal Na- and Ca-montmorillonite particles were monitored as a function of time and distance from the colloid bed in different ionic strength solutions. A stable pseudo-equilibrium concentration was reached after time in generation and sedimentation experiments. The colloid concentration decreased sharply at distances near to the colloid source. Na-montmorillonite concentration at pseudo-equilibrium (roughly quantified at distances > or = 7 cm from the colloid source) was 5.2 +/- 0.5, 0.5 +/- 0.1, and 0.2 +/- 0.1 mg L(-1) in 0.001, 0.01, and 0.1 M NaCl solution, respectively, while the Ca-montmorillonite concentration was 0.4 +/- 0.2 mg L(-1) in 0.001 M NaCl. |
| Databáze: | OpenAIRE |
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