The viscosity of a dilute suspension of sodium montmorillonite in an alkaline state

Miyahara, Kazumi; Adachi, Yasuhisa; Nakaishi, Katsuya

doi:10.1016/s0927-7757(96)03961-1

Cited by 20 publications

(5 citation statements)

References 13 publications

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“…Care was taken for the correction of the volume fraction of clay due to the loss by the adhesion of clay to the vane and reagent spoon. In the calculation of volume fraction, the density of montmorillonite was assumed to be 2.68 g/cm 3 [21]. Exactly the same procedure for obtaining volume fraction was carried out for each subsequent procedure.…”

Section: Methodsmentioning

confidence: 99%

Effects of salt concentration on the yield stress of sodium montmorillonite suspension

Sakairi

Kobayashi

Adachi

2005

Journal of Colloid and Interface Science

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Section: Methodsmentioning

confidence: 99%

Effects of salt concentration on the yield stress of sodium montmorillonite suspension

Sakairi

Kobayashi

Adachi

2005

Journal of Colloid and Interface Science

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“…3) (Kelessidis et al, 2007). Miyahara et al (1998) examined the maximum sedimentation rate as a function of the volume fraction of solids at a pH value of 10, with NaCl concentrations ranging from 0.5 to 1.5 M. The equivalent hydrodynamic diameter of the floc (d f ) and increment ratio of the effective volume fraction of the particles (α) increased with the salt concentration, and the value of α agreed qualitatively with the values obtained from the rheological data (Batchelor, 1977;Miyahara et al, 1998). The observed increase in d f was ascribed to F-F association, as the vicinal platelets approach and form flocs with more irregular shapes with increasing salt concentrations (Miyahara et al, 2001).…”

Section: The Role Of Electrolytesmentioning

confidence: 99%

Clay minerals in drilling fluids: functions and challenges

Zhang

Christidis

et al. 2020

Clay miner.

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The addition of clay minerals in drilling fluids modifies the dispersion's viscosity. In this article, scientific advances related to the use of clays and clay minerals (bentonite, palygorskite, sepiolite and mixtures of clay minerals) in drilling fluids are summarized and discussed based on their specific structure, rheological properties, applications, prevailing challenges and future directions. The rheological properties of drilling fluids are affected by the temperature, type of electrolytes, pH and concentration of clay minerals. Bentonites are smectite-rich clays often used in drilling fluids, and their composition varies from deposit to deposit. Such variations significantly affect the behaviour of bentonite-based drilling fluids. Palygorskite is suitable for use in oil-based drilling fluids, but the gelation and gel structures of palygorskite-added drilling fluids have not received much attention. Sepiolite is often used in water-based drilling fluids as a rheological additive. Dispersions containing mixtures of clays including bentonite, kaolin, palygorskite and sepiolite are used in drilling fluids requiring specific features such as high-density drilling fluids or those used in impermeable slurry walls. In these cases, the surface chemistry–microstructure–property relationships of mixed-clay dispersions need to be understood fully. The prevailing challenges and future directions in drilling fluids research include safety, ‘green’ processes and high-temperature and high-pressure-resistant clay minerals.

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“…We measured the location of interface between sediment and supernatant as a function of elapsed time. When the concentration of sodium chloride exceeds 0.5 M, the montmorillonite suspension is known to form big flocs irrespective of pH value (Miyahara et al 1998). This is suitable for naked-eye observation.…”

Section: Sedimentation Behaviormentioning

confidence: 99%

Effect of the concentration of NaCl and cylinder height on the sedimentation of flocculated suspension of Na-montmorillonite in the semi-dilute regime

Ghazali

Argo

Kyotoh

et al. 2019

Paddy Water Environ

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In this study, we focused on the effect of the degree of floc growth on the moving velocity of the interface between sediment of flocculated montmorillonite and supernatant in the semi-dilute suspension, which is characterized by the start of an extremely slow movement of interface followed by an abrupt settling and ending in consolidation. Na-montmorillonite suspension coagulated under different ionic strengths, ranging from 0.5 M to 1.5 M of NaCl, was placed in a settling cylinder. The initial height of suspension was varied from 13 cm to 50 cm. The flocculated suspension was left to settle in the cylinder after the manual mixing of end-over-end. Changes in the height of the interface between the flocculated sediment and the transparent supernatant were measured as a function of elapsed time. It was confirmed that the maximum settling velocity increased with an increase in the height of cylinder within the range of our measurement. This tendency was found to be more significantly pronounced by the growth of flocs. This result indicates the presence of a feed-forward mechanism to enhance the upward motion of fluid or downward motion of flocculated sediment, or both. That means, sedimentation is accelerated by the growth of big flocs, and the growth of big flocs is accelerated by the sedimentation. These motions will eventually induce the generation of an upward plume or channel of water. The formed plume flutters slowly with rather a large scale. We term this phenomenon the "sedimentation turbulence."

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The viscosity of a dilute suspension of sodium montmorillonite in an alkaline state

Cited by 20 publications

References 13 publications

Effects of salt concentration on the yield stress of sodium montmorillonite suspension

Effects of salt concentration on the yield stress of sodium montmorillonite suspension

Clay minerals in drilling fluids: functions and challenges

Effect of the concentration of NaCl and cylinder height on the sedimentation of flocculated suspension of Na-montmorillonite in the semi-dilute regime

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