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EFFECT OF SURFACTANTS AND GRAFTED …
Under studied conditions, grafted bentonite effectively showed excellent dispersion stability. Keywords: bentonite, grafted polymer, pH, surfactants, stability. Most of hydrocarbon …
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RHEOLOGICAL PROPERTIES OF ACID-ACTIVATED …
and the charge distribution on the clay surface can lead to a better understanding of the interactions between clay particles, because the rheological properties of bentonite dispersions can be greatly affected by the interactions between charged clay particles as well as the interactions between clay and water molecules (Gu¨nister et al., 2006).
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KUNIPIA / SUMECTON | KUNIMINE INDUSTRIES CO., LTD.
KUNIPIA and SUMECTON separated into unit layers form a thick hydrate layer in the unit layer surfaces, which increases the solid phase rate in the dispersion liquid. This makes the viscosity of the dispersion liquid much higher than that of the dispersion medium or water. This is why the clay shows a viscous property.
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Calcium Bentonite Vs Sodium Bentonite
Calcium Bentonite, commonly referred to as Southern or non-swelling Bentonite, does not swell to the same extent as Sodium Bentonite but has superior adsorption properties. This makes it the Bentonite of choice for applications like detoxifying the body, purifying drinking water, or as a desiccant in the preservation of historical artifacts.
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Comparison of the Critical Coagulation Concentrations of …
Clays consist of fine particles (clay minerals) which under certain conditions can be dispersed in water, forming a fairly stable dispersion. The stability of the clay mineral dispersions depends on the pH, solid/liquid ratio, and most of all on the type and concentration of dissolved ions. The difference between the dispersibility of different clays is not yet understood. In the …
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Solutions for Your TOUGHEST MIXING CHEMICALS
The vessel is charged with water and the Silverson mixer is started, creating vigorous in-tank agitation. The bentonite is added and rapidly dispersed into the water. The high speed rotation …
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The Modification of Rheological Properties of Bentonite-Water
The pure bentonite dispersions were prepared by adding bentonite slowly to deionized water under magnetic stirring conditions, to avoid the formation of aggregates and ensure homogeneous dispersion. In the case of bentonite-surfactant dispersions, the surfactant solutions ( 1.0 × 10−3 M, International Journal of Chemical Engineering and ...
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EFFECT OF SURFACTANTS AND GRAFTED …
the blending of the bentonite dispersions and T at a given time. Figure-2. Principle of Turbiscan measurement. RESULTS AND DISCUSSION When surfactants added to bentonite dispersion, surfactants molecules interact with dispersed particles based on cationic or anionic character and bentonite particles charge nature. Bentonite particles have negative
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Techno File: Bentonite
Charge Attraction: The interaction between charged particles. Oppositely charged particles attract each other, while like-charged particles repel each other. Colloidal Particles: Particles whose …
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High Speed Dispersion of Bentonite
The vessel is charged with water and the Silverson mixer is started, creating vigorous in-tank agitation. The bentonite is added and rapidly dispersed into the water. The high speed rotation of the rotor creates a powerful suction which draws the water and clay up from the base of the vessel into the workhead.
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Controlled flocculation of coarse suspensions by colloidally …
tonite. The interaction of the coarse, positively charged bismuth subnitrate particles in aqueous suspension with negatively charged, colloidally dispersed bentonite was investigated by measuring elec- trophoretic mobility, sedimentation volume, and viscosity. Gradual addition of bentonite dispersion to bismuth subnitrate suspensions
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Surface charge characteristics of Gaomiaozi bentonite in high …
GMZ bentonite is regarded as an ideal backfill (buffer) material for China's high-level nuclear waste repository [1], [2].The bentonite minerals, characterized by a laminated structure, carry a negative charge [3,4].Their surface charge properties impact not only the adsorption capacity of nuclear elements but also play a crucial role in the formation of the …
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(PDF) Impact of organic contaminant viscosity and cation …
pH variations of Na-bentonite dispersion, in the water-organic mixture and in the presence of (a) 0 and 0.01 M NaCl, (b) 0.1 and 0.5 M NaCl ... Liquid limit (%) 337. Plasticity index (%) 298 ...
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Rheological Properties of Bentonite Suspensions Modified …
Bentonite Two different types of bentonite were used, in the following named bentonite A and B. Some parameters of the characterisation of the bentonites are summarized in Table 1. Bentonite A is a natural sodium bentonite with Na+ ions in the montmorillonite interlayers. Bentonite B is an activated calcium bentonite, which means the Ca2+
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Choline chloride based natural deep eutectic solvent for
The surface (face) of the bentonite plate is permanently charged with a negative charge as a result to its amphoteric properties. However, a conditional net charge is associated with the plate's edges depending on the pH of the environment, a net positive charge in acidic environments and a net negative charge in alkaline environments.
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Chemical Industry Case Study: High Speed Dispersion of Bentonite
2. Despite the diversity of end uses, and the various processing methods and equipment used, there are a number of common processing requirements which must be satisfied in order to obtain maximized "functionality": • Mixing equipment must be capable of rapidly incorporating and dispersing the powder into the base liquid. • The bentonite particles must be …
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Colloidal stability of bentonite clay considering surface charge
The bentonite colloid suspension was prepared by the following procedure. First, the bentonite clay was dispersed in deionized Milli-Q water (18.2 MΩ cm) at a solid to solution ratio of 1:20 (50 g of bentonite in 1 L of Milli-Q water). The bentonite suspension was left in contact after dispersion with an ultrasonic device for 1 h.
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(PDF) Comparison of the Critical Coagulation …
Lower solid/liquid ratios were not suitable because of the visibility of the dispersion which was particularly poor in case of white bentonites. For the investigation of such dispersions spectroscopic
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High Speed Dispersion of Bentonite
The vessel is charged with water and the Silverson mixer is started, creating vigorous in-tank agitation. The bentonite is added and rapidly dispersed into the water. The high speed rotation of the rotor creates a powerful suction which …
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Bentonite
Most impressive is the diaphragm-walling technique. A thixotropic bentonite dispersion is used as an intermediate supporting material, obviating the need for revetting (retaining wall) when the trench is excavated. ... Materials very similar to litter, both clumping and nonclumping, are used in industry to clean up liquid spills. Bentonite ...
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High Speed Dispersion of Bentonite
Operation is as follows: The vessel is charged with water and the Silverson mixer is started, creating vigorous in-tank agitation. The bentonite is added and rapidly dispersed into the water. The high speed rotation of the rotor creates a …
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Bentonite as a water-insoluble amorphous solid dispersion matrix …
Bentonite as a water-insoluble amorphous solid dispersion matrix for enhancing oral bioavailability of poorly water-soluble drugs ... by adsorbing SF onto BT under acidic conditions using the ionic interaction between cationic SF and negatively charged BT. Scanning electron microscopy (SEM), powder X-ray diffractometry (pXRD), and differential ...
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Pharmaceutical Colloidal Dispersion | PPT
7. LYOPHOBIC COLLOIDS • These are the dispersion that have little attraction (solvent hating), is possible between the dispersed phase and dispersion medium. • These are also referred as extrinsic colloids. • This is due to primarily the absence of a solvent sheath around the particles • These are stable because of the presence of a charge on particles.
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Rheology of bentonite dispersions: Role of ionic strength and solid
While in aqueous clay dispersions, the solid phase in the system composes of charged and disk-shaped nano-particles. Their faces carry permanently negative charges, and …
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US5484834A
A liquid slurry of bentonite which comprises bentonite, water, a polyacrylate, and a sodium salt of silicic acid. ... After all of the bentonite is charged into the vessel, mix for an additional hour. ... The suspension agent provides improved wetting, dispersion, stabilization and fluidization which can give rise to a variety of effects which ...
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Principles of flow of kaolin and bentonite dispersions
At a certain higher water content the clay begins to flow when jarred slightly. This water content, again expressed as a percentage of oven-dried clay, is the Atterberg liquid limit. The difference between the liquid limit and plastic limit, the plasticity index, describes the range of water content in which a clay is plastic (Table I).
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Application of bentonite in water-based drilling fluids
Therefore the edge charge varies with the pH values in aqueous dispersion. The point of zero charge (PZC), defined as the pH value at which the neat charge of Mt reaches zero, is a critical parameter. ... Studying the microstructure of Mt in aqueous systems is challenging because a liquid clay mineral sample cannot be used in traditional ...
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Solutions for Your TOUGHEST MIXING CHEMICALS
the powder into the base liquid. • The bentonite particles must be reduced to their finest constituent parts to expose the maximum surface area to the surrounding liquid and activate the gelling effect. • A degree of shear is required to obtain functionality. • Vigorous in-tank movement must be maintained as the viscosity rises.
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The colloidal and rheological properties of bentonite suspensions
In the case where liquid is the dispersion medium, rather than a vacuum, this constant must be replaced by an effective Hamaker constant, calculated from the expression: …
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Laponite®—From Dispersion to Gel—Structure, Properties, and
Abstract. Laponite ® (LAP) is an intensively studied synthetic clay due to the versatility given by its layered structure, which makes it usable in various applications. This review describes the multifaceted properties and applications of LAP in aqueous dispersions and gel systems. The first sections of the review discuss the LAP structure and the interactions between clay discs in an ...
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