Rheology of sodium and calcium bentonite–water dispersions: Effect of electrolytes and aging time

Abu-Jdayil, Basim

doi:10.1016/j.minpro.2011.01.001

Cited by 135 publications

(74 citation statements)

References 34 publications

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“…This difference may be due to a high salinity of the present suspensions (0.6 M). In fact, the yield stress and viscosity of smectite suspensions decrease with increasing electrolyte concentration (Abu-Jdayil, 2011;Kelessidis et al, 2006), which is consistent with the present results. Moreover, our data demonstrate that as little as 10 wt % of smectite in the solid can effectively modify the bulk suspension rheology in response to changes in the electrolyte concentration.…”

Section: Factors Affecting the Rheological Properties Of Composite Smsupporting

confidence: 93%

Sensitivity of Clay Suspension Rheological Properties to pH, Temperature, Salinity, and Smectite‐Quartz Ratio

Kameda

Morisaki

2017

Geophysical Research Letters

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Understanding the rheological properties of clay suspensions is critical to assessing the behavior of sediment gravity flows such as debris flow or turbidity current. We conducted rheological measurements of composite smectite‐quartz suspensions at a temperature of 7°C and a salt concentration of 0.6 M. This is representative of smectite‐bearing sediments under conditions on the seafloor. The flow curves obtained were fitted by the Bingham fluid model, from which we determined the Bingham yield stress and dynamic viscosity of each suspension. At a constant smectite‐quartz mixing ratio, the yield stress and the dynamic viscosity tend to increase as the solid/water ratio of the suspension is increased. In the case of a constant solid/water ratio, these values increase with increasing smectite content in the smectite‐quartz mixture. Additional experiments exploring differing physicochemical conditions (pH 1.0–9.0; temperature 2–30°C; and electrolyte (NaCl) concentration 0.2–0.6 M) revealed that the influence of temperature is negligible, while pH moderately affects the rheology of the suspension. More significantly, the electrolyte concentration greatly affects the flow behavior. These variations can be explained by direct and/or indirect (double‐layer) interactions between smectite‐smectite particles as well as between smectite‐quartz particles in the suspension. Although smectite is known as a frictionally weak material, our experimental results suggest that its occurrence can reduce the likelihood that slope failure initiates. Furthermore, smectite can effectively suppress the spreading distance once the slope has failed.

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Section: Factors Affecting the Rheological Properties Of Composite Smsupporting

confidence: 93%

Sensitivity of Clay Suspension Rheological Properties to pH, Temperature, Salinity, and Smectite‐Quartz Ratio

Kameda

Morisaki

2017

Geophysical Research Letters

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“…Among others, it also has specific rheological properties: its viscosity decreases with time under the effect of constant shear. It is considered thixotropic [34]. The particle size distributions of apatite gel and silicate sand are presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The metal aqueous solution of Cu(II) were prepared from their nitrate salt. The removal capacity was 0.016-0.764 mmol of Cu/g [34]. Based on these results, the gel content of the apatite was set at 5 %.…”

Section: Formulation Of Reactive Materials Consisting Of Sand Apatitmentioning

confidence: 99%

Formulation of a Permeable Reactive Mixture for Groundwater Remediation Based on an Industrial Co-product: Permeability and Copper Retention Study

Belhaj-Trabelsi

Lafhaj

Zakaria

et al. 2015

Waste Biomass Valor

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The objective of this research is to formulate a permeable material based on apatite gel having the ability to retain heavy metals, to be used in a permeable reactive barrier (PRB), an in situ passive groundwater treatment technology. This new material is produced from non-toxic waste in the research laboratory of a chemical company. It is characterised by a thixotropic behaviour and a high ion exchange capacity. The apatite gel is the active agent of the reactive material; it ensures the retention of heavy metals by ion exchange. Sand and an organic binder are also incorporated into the mixture, providing both high permeability and mechanical strength to the mixtures. An original experimental apparatus intended for measuring both water permeability and the retention of heavy metals has been specially designed and developed for this study. The mixture consisting of 95 % silica sand, 5 % apatite gel and 3 % epoxy was qualified as a suitable PRB mixture, due its high permeability, its good retention capacity and its acceptable mechanical strength.

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“…This phenomenon was ascribed to the low hydrogel viscosity and for this reason three new hydrogels (2, 3 and 4) were prepared with an increased amount of bentonite (Table S1) well known as rheological modifier agent [40]. The idea was that the increase of bentonite content could improve the hydrogel viscosity and thus its stability.…”

Section: Hydrogel Film Preparationmentioning

confidence: 99%

Bioadhesive Polymeric Films Based on Red Onion Skins Extract for Wound Treatment: An Innovative and Eco-Friendly Formulation

et al. 2020

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The onion non-edible outside layers represent a widely available waste material deriving from its processing and consumption. As onion is a vegetable showing many beneficial properties for human health, a study aiming to evaluate the use of extract deriving from the non-edible outside layers was planned. An eco-friendly extraction method was optimized using a hydroalcoholic solution as solvent. The obtained extract was deeply characterized by in vitro methods and then formulated in autoadhesive, biocompatible and pain-free hydrogel polymeric films. The extract, very soluble in water, showed antioxidant, radical scavenging, antibacterial and anti-inflammatory activities, suggesting a potential dermal application for wounds treatment. In vitro studies showed a sustained release of the extract from the hydrogel polymeric film suitable to reach concentrations necessary for both antibacterial and anti-inflammatory activities. Test performed on human keratinocytes showed that the formulation is safe suggesting that the projected formulation could be a valuable tool for wound treatment.

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Rheology of sodium and calcium bentonite–water dispersions: Effect of electrolytes and aging time

Cited by 135 publications

References 34 publications

Sensitivity of Clay Suspension Rheological Properties to pH, Temperature, Salinity, and Smectite‐Quartz Ratio

Sensitivity of Clay Suspension Rheological Properties to pH, Temperature, Salinity, and Smectite‐Quartz Ratio

Formulation of a Permeable Reactive Mixture for Groundwater Remediation Based on an Industrial Co-product: Permeability and Copper Retention Study

Bioadhesive Polymeric Films Based on Red Onion Skins Extract for Wound Treatment: An Innovative and Eco-Friendly Formulation

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