Electrokinetic study of kaolinite suspensions

Chassagne, Claire; Mietta, F.; Winterwerp, Johan C.

doi:10.1016/j.jcis.2009.02.052

Cited by 72 publications

(43 citation statements)

References 21 publications

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“…As discussed in Chassagne et al (2009), the magnitude of the ζ potential using this formula may not be correct. However, we will show that, as for kaolinite, the variation of the Smoluchowski ζ potential with the properties of the suspension provides useful information for the flocculation behavior.…”

Section: ζ Potentialmentioning

confidence: 99%

Influence of shear rate, organic matter content, pH and salinity on mud flocculation

et al. 2009

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The purpose of this paper is to establish a relation between a few measurable quantities (the socalled ζ potential, organic matter content, and shear rate) and the flocculation behavior of mud. The results obtained with small-scale flocculation experiments (mixing jar) are compared to results of large-scale experiments (settling column). The mud used for all experiments has been collected in October 2007 in the lower Western Schelde, near Antwerp, Belgium. From this study, it was found that the mean floc size and the Kolmogorov microscale vary in a similar way with the shear rate for suspensions with different pH and salt concentrations. The size of flocs at a given shear rate depends on the properties of the suspension, which affect the electrokinetic properties of the sediment; these can be described by means of the ζ potential. The main findings of this paper are: (1) In saline suspensions at pH = 8, the mean floc size increases when the salt concentration and the ζ potential increase. (2) For a given ζ potential, the mean floc size at low pH is larger than observed at pH = 8 for any added salt. (3) The mean floc size increases with increasing organic matter content. (4) Mud with no organic matter at pH = 8 and no added salt flocculates very little. The response of mud suspensions to variations in salinity and pH is similar to that of kaolinite. This suggests that a general trend can be established for different and complex types of clays and mud. This systematic study can therefore be used for further development of flocculation models.

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Section: ζ Potentialmentioning

confidence: 99%

Influence of shear rate, organic matter content, pH and salinity on mud flocculation

et al. 2009

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“…The zeta-potential and the surface charge of kaolinite have been widely studied in the literature [3,8,17,18]. An electrokinetic study of the kaolinite used in this study has been presented in Chassagne et al [9]. Chassagne et al showed that caution should be taken when converting the electrophoretic mobility data into electrokinetic charges or zeta-potential.…”

Section: Electrokinetic Propertiesmentioning

confidence: 99%

“…As demonstrated in Chassagne et al [9], the Smoluchowsky formula cannot be applied to clays. However, we will show that the variation of the electrophoretic mobility (Smoluchowsky zeta-potential) with pH and added salt can be used to predict the variation of the flocculation behavior of the corresponding suspensions.…”

Section: Introductionmentioning

confidence: 99%

Shear-induced flocculation of a suspension of kaolinite as function of pH and salt concentration

Mietta

Chassagne

Winterwerp

2009

Journal of Colloid and Interface Science

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“…For future developments, the zeta potential of clay such as bentonite should be adjusted according to Chassagne et al [42]. The Smoluchowski's model is based on the assumption of spherical particles, which is not appropriate for clay platelets.…”

Section: Final Considerations and Future Developmentsmentioning

confidence: 99%

Bentonite electrical conductivity: a model based on series–parallel transport

2010

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Bentonite has significant applications nowadays, among them as landfill liners, in concrete industry as a repairing material, and as drilling mud in oil well construction. The application of an electric field to such perimeters is under wide discussion, and subject of many studies. However, to understand the behaviour of such an expansive and plastic material under the influence of an electric field, the perception of its electrical properties is essential. This work serves to compare existing data of such electrical behaviour with new laboratorial results. Electrical conductivity is a pertinent parameter since it indicates how much a material is prone to conduct electricity. In the current study, total conductivity of a compacted porous medium was established to be dependent upon density of the bentonite plug. Therefore, surface conductivity was addressed and a series-parallel transport model used to quantify/predict the total conductivity of the system.

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Electrokinetic study of kaolinite suspensions

Cited by 72 publications

References 21 publications

Influence of shear rate, organic matter content, pH and salinity on mud flocculation

Influence of shear rate, organic matter content, pH and salinity on mud flocculation

Shear-induced flocculation of a suspension of kaolinite as function of pH and salt concentration

Bentonite electrical conductivity: a model based on series–parallel transport

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