Effects of Added Silica Nanoparticles on Hectorite Gels

Kleshchanok, Dzina; Meester, Vera; Pompe, Cornelia E.; Hilhorst, Jan; Lekkerkerker, H. N. W.

doi:10.1021/jp302472e

Cited by 18 publications

(12 citation statements)

References 20 publications

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“…This may be due to enhancement of double‐layer interactions between smectite particles. Several studies have investigated the effect of silica nanoparticles (amorphous silica, ~20 nm diameter) on the rheological behavior of smectite suspensions (Hilhorst et al, ; Kleshchanok et al, ; Landman et al, ). These works found that small quantities of silica nanoparticles can significantly modify the transitional behavior of the liquid crystal phases in smectite suspensions.…”

Section: Discussionmentioning

confidence: 99%

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: Discussionmentioning

confidence: 99%

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

Kameda

Morisaki

2017

Geophysical Research Letters

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“…These have been investigated ever since Zocher and Langmuir reported liquid crystalline phases in dispersions of vanadium pentoxide ribbons [1] and hectorite clay platelets [2]. However Langmuir's work has so far proven impossible to reproduce [3][4][5]. Onsager matched theory to work done on the rod shaped tobacco mosaic virus (TMV) and suggested that the level of anisotropy in the particles is the reason for the phase separation, with the loss of orientational entropy in the nematic phase compensated for by the increase in translational entropy [6].…”

Section: Introductionmentioning

confidence: 99%

Isotropic–nematic phase transition in aqueous sepiolite suspensions

Woolston

Duijneveldt

2015

Journal of Colloid and Interface Science

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Aqueous suspensions of sepiolite clay rods in water tend to form gels on increase of concentration. Here it is shown how addition of a small amount (0.1% of the clay mass) of a common stabiliser for clay suspensions, sodium polyacrylate, can allow the observation of an isotropic-nematic liquid crystal phase transition. This transition was found to move to higher clay concentrations upon adding NaCl, with samples containing 10(-3) M salt or above only displaying a gel phase. Even samples that initially formed liquid crystals had a tendency to form gels after several weeks, possibly due to Mg(2+) ions leaching from the clay mineral.

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“…where negatively charged clay particles are mixed with negatively charged nanoparticles. In a series of papers, Lekkerkerker and co-workers 89,110,147,148 looked at the effect of anionic silica nanoparticles on hectorite, montmorillonite and beidellite. At low clay concentrations the silica addition led in general to weaker gels compared to the pure clay system and to incipient phase separation, although the specic manifestation of this differed according to the clay.…”

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confidence: 99%

Smectite clay – inorganic nanoparticle mixed suspensions: phase behaviour and rheology

2015

Self Cite

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Smectite clay minerals and their suspensions have long been of both great scientific and applications interest and continue to display a remarkable range of new and interesting behaviour. Recently there has been an increasing interest in the properties of mixed suspensions of such clays with nanoparticles of different size, shape and charge. This review aims to summarize the current status of research in this area focusing on phase behaviour and rheological properties. We will emphasize the rich range of data that has emerged for these systems and the challenges they present for future investigations. The review starts with a brief overview of the behaviour and current understanding of pure smectite clays and their suspensions. We then cover the work on smectite clay-inorganic nanoparticle mixed suspensions according to the shape and charge of the nanoparticles -spheres, rods and plates either positively or negatively charged. We conclude with a summary of the overarching trends that emerge from these studies and indicate where gaps in our understanding need further research for better understanding the underlying chemistry and physics.

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Effects of Added Silica Nanoparticles on Hectorite Gels

Cited by 18 publications

References 20 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

Isotropic–nematic phase transition in aqueous sepiolite suspensions

Smectite clay – inorganic nanoparticle mixed suspensions: phase behaviour and rheology

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