2004
DOI: 10.1021/la0489108
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Phase Diagrams of Wyoming Na-Montmorillonite Clay. Influence of Particle Anisotropy

Abstract: Natural Na-Wyoming montmorillonite was size fractionated by successive centrifugation. Polydisperse particles with average sizes of 400, 290, and 75 nm were then obtained. As the structural charge of the particles belonging to three fractions (determined by cationic exchange capacity measurements) is the same, such a procedure allows studying the effect of particle anisotropy on the colloidal phase behavior of swelling clay particles. Osmotic stress experiments were carried out at different ionic strengths. Th… Show more

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Cited by 170 publications
(243 citation statements)
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References 72 publications
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“…At medium and low NaCl concentration, a gel also formed at MMT concentration above 3 wt%. This observation is in line with previous studies on MMT [25,42,49] and Laponite [26,52]. However, the clay concentration where the sol/gel transition occurred varies slightly, depending on the origin of the clay.…”
Section: Results (A) Phase Diagram Of Pure Montmorillonitesupporting
confidence: 92%
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“…At medium and low NaCl concentration, a gel also formed at MMT concentration above 3 wt%. This observation is in line with previous studies on MMT [25,42,49] and Laponite [26,52]. However, the clay concentration where the sol/gel transition occurred varies slightly, depending on the origin of the clay.…”
Section: Results (A) Phase Diagram Of Pure Montmorillonitesupporting
confidence: 92%
“…The samples were poured out from the vials and left to rest 5 min before each measurement. The elastic modulus G and the viscous modulus G were obtained and the following criteria were used to identify a gel: (i) G is obviously higher than G and (ii) G does not vary much over the whole frequency range [25]. …”
Section: (C) Rheologymentioning
confidence: 99%
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“…At concentrations above the repulsive gel transition, where the hydrodynamic volumes swept out by the particles overlap, a yield stress develops, and the suspension becomes viscoplastic. The yield stress depends on the clay volume fraction, the particle size, 88 shape, 89,90 and localisation of the charge in the clay layer structure. 109 The gel phase of these particle suspensions is quite "fragile", yielding under small strains of $1-10 percent, (unlike polymer gels where yield strains of several hundred percent are common).…”
Section: Smectite Suspension Rheologymentioning
confidence: 99%
“…The phase diagram of MMT is least explored in the literature, though some attempts in that direction have been made in the past 4,5 . But a systematic study of the aging dynamics has not been performed as yet.…”
mentioning
confidence: 99%