Colloidal properties of synthetic hectorite clay dispersion measured by dynamic light scattering and small angle X-ray scattering

Mori, Yasushige; Togashi, Kohsuke; Nakamura, Keitarou

doi:10.1163/156855201744958

Cited by 34 publications

(20 citation statements)

References 29 publications

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“…In this research, synthetic goethite was used to examine how aggregation of Fe oxides is affected by silicic acid. Time‐resolved dynamic light scattering (DLS), used to quantify the hydrodynamic diameter of particles in suspension, has been applied previously to monodisperse model colloids such as latex microspheres (Holthoff et al ., ) and clay colloids (Kretzschmar et al ., ; Mori et al ., ). Cornell & Schwertmann () reported that this method can also be used with larger particles that have a non‐spherical shape.…”

Section: Introductionmentioning

confidence: 97%

Effect of silicic acid on the aggregation properties of goethite

Nguyen

Picardal

Dultz

et al. 2017

European J Soil Science

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Summary Aggregation properties of iron oxide particles have received much attention because of their environmental importance in soil and aquatic environments. The effects of silicic acid on the pH‐dependent surface charges that govern the aggregation of goethite have received little attention. In this study we determined the effect of silicic acid as a function of pH and ionic strength (IS) on the aggregation of a synthetic goethite by a combination of particle‐size analysis using dynamic light scattering and test tube experiments to quantify particles in suspension. We investigated silicic acid adsorption on goethite quantitatively by batch adsorption isotherms, and the changes in surface charge on the adsorption of silicic acid were identified by the zeta potential (ζ). Our results revealed that silicic acid can lead to a significant decrease in ζ. A change in the pHiep (iep: isoelectric point) from 8.5 to lower pH values, typically pH 4–5.5, in the presence of silicic acid suggests enhanced aggregation of goethite in the acidic pH range. At alkaline pH, both goethite and silicic acid were negatively charged because of strong deprotonation, and silicic acid adsorption promoted goethite dispersion. Ionic strength affected the aggregation of goethite by shifting ζ towards the iep and it can also obscure the role of silicic acid. Highlights Effect of silicic acid on surface charge and aggregation of goethite was investigated. Adsorption of silicic acid reduces ζ and allows goethite to aggregate at lower pH. Ionic strength can also affect aggregation of goethite by shifting ζ towards the isoelectric point. Silicic acid in soil might maintain goethite particles in an aggregated state.

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Section: Introductionmentioning

confidence: 97%

Effect of silicic acid on the aggregation properties of goethite

Nguyen

Picardal

Dultz

et al. 2017

European J Soil Science

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“…Current research dealing with laponite is mainly focused on preparation methods (Torii and Iwasaki 1987;Vicente et al 2009Vicente et al , 2010, laponite organic modification (Malakul et al 1998;Mustafa et al 2016), laponite nanocomposite (Batista et al 2011;Ghadiri et al 2013 Orakdogen 2016), stabilizers of Pickering emulsions (Li et al 2009;Teixeira et al 2011), as well as state or performance of laponite dispersions, such as rheology (Pignon et al 1997a, b;Joshi et al 2008;, phase state (Mourchid et al 1998;Mohanty and Joshi 2016), colloidal properties (Mori et al 2001;Willenbacher 1996) and viscoelastic structure (Pignon et al 1997a, b;Mourchid et al 1998). Nevertheless, research dealing with applications of laponite in water-based drilling fluids is rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of laponite as a mud-making material for drilling fluids

Xiong¹,

Li²,

Fu³

et al. 2019

Pet. Sci.

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In this study, laponite was tested as a mud-making material for drilling fluids. Laponite is a synthetic smectite clay with a structure and composition closely resembling the natural clay mineral hectorite. Commercially available laponite was characterized by X-ray diffractometry, scanning electron microscopy and infrared spectrometry. Its dispersibility, salt resistance and high-temperature resistance were evaluated. The results showed that laponite possessed superior cation exchange capacity (140.4 mmol/100 g) with interlayer cations of Na + and Li + . Laponite could easily be dispersed in water to yield increased viscosity with no influence from hydration time or temperature. On the other hand, laponite dispersions displayed an excellent heat resistance, with invariant apparent viscosity at high temperatures. For instance, the apparent viscosity of the 2 wt% laponite dispersion underwent changes between 22 and 24 mPa s after hot rolling at 180-240 °C for 16 h. Compared to existing mud-making materials, laponite exhibited better mud-making properties. Furthermore, laponite revealed good compatibility with other additives, and the water-based drilling fluids prepared with laponite as mud-making material showed an excellent stability at elevated temperatures and superior performance-cost ratios. Overall, these findings indicated that laponite had an excellent dispersibility at high temperatures and hence would have promising applications as high-temperature mud-making material for preparing water-based drilling fluids designed for ultra-high-temperature environments.

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“…Melt synthesized hectorites come in diameters of up to 20 µm and moreover can be utterly delaminated into 1 nm thick nanosheets by repulsive osmotic swelling simply by immersing them into water . The suspensions obtained represent viscous liquid crystalline (nematic) phases because the huge aspect ratio blocks isotropic rotation . The nematic phases can, however, easily be mixed with water‐soluble polymers without triggering any reaggregation.…”

Section: Introductionmentioning

confidence: 99%

Filter‐Through Method of Making Highly Efficient Polymer‐Clay Nanocomposite Membranes

Zhu

Habel

Schilling

et al. 2019

Macro Materials & Eng

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Electrospun filter with hierarchical pore structure and variable pore diameter is used for the first time in making a flexible, strong, and high gas‐barrier membrane. A versatile, technical, benign processing method for the fabrication of highly filled (>25 wt%) efficient gas‐barrier polymer membrane with perfectly aligned synthetic high‐aspect ratio layered silicate (clay) of variable and considerable thickness (up to 5 µm) is presented. This process combines advantageous features of an electrospun substrate like high porosity, variable pore size (typically <5 µm), thermoplasticity and of an aqueous suspension of a synthetic clay consisting of single 1 nm thick layers with a huge median lateral extension (>10 µm) in a layered structure. By simple and fast filtration, a gas‐barrier self‐assembled layer of variable and appropriate thickness is obtained on a mechanically stable thermoplastic electrospun filter support that subsequently can be laminated adhesively or via hot pressing, even in a multilayer structure, if required. The resulting composite membranes are flexible, strong, transparent, and show enhanced gas‐barrier properties.

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Colloidal properties of synthetic hectorite clay dispersion measured by dynamic light scattering and small angle X-ray scattering

Cited by 34 publications

References 29 publications

Effect of silicic acid on the aggregation properties of goethite

Effect of silicic acid on the aggregation properties of goethite

Performance evaluation of laponite as a mud-making material for drilling fluids

Filter‐Through Method of Making Highly Efficient Polymer‐Clay Nanocomposite Membranes

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