Effect of polyelectrolyte mixtures on the electrokinetic potential and kinetics of flocculation of clay mineral particles

Bárány, Sándor; Mészáros, Renáta Zákányiné; Marcinova, L.; Škvarla, Jiřı́

doi:10.1016/j.colsurfa.2011.01.051

Cited by 34 publications

(13 citation statements)

References 21 publications

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“…Similar behaviour we observed for all investigated particles having adsorbed cationic polymers of different charge density [48][49][50][51][52][53]. Effect of pH on the electrokinetic potential of polyelectrolyte-covered particles is illustrated by Fig.…”

Section: Accepted Manuscriptsupporting

confidence: 79%

“…We have performed a systematic study on the effect of anionic and cationic polyelectrolytes on the electrokinetic potential of negatively charged polystryrene, silica, bentonite and kaolin particles as a function of the polymer dose, pH, charge density (CD) of the polyelectrolyte, electrolyte concentration [48][49][50][51][52][53]. It should be stressed that our independent adsorption measurements testify that in the PE concentration range described in this section, the whole added polymer is adsorbed by particles, i.e.…”

Section: Effect Of Individual Polyelectrolytesmentioning

confidence: 94%

“…At the same time the amount of adsorbed cationic polyelectrolytes at which the iep of bentonite or kaolin particles is reached represents only a fraction of the surface charge density of these minerals [44,[48][49][50]53]. It means that the conventional approach, according to which the isoelectric point is reached at nearly the compensation of the surface charge by oppositely charged multivalent counter-ions or surfactant-ions, is not valid for adsorption of high molecular polyelectrolytes onto clay minerals surface.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Polymer adsorption and electrokinetic potential of dispersed particles in weak and strong electric fields

Bárány

2015

Advances in Colloid and Interface Science

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Section: Accepted Manuscriptsupporting

confidence: 79%

Section: Effect Of Individual Polyelectrolytesmentioning

confidence: 94%

Section: Accepted Manuscriptmentioning

confidence: 99%

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Polymer adsorption and electrokinetic potential of dispersed particles in weak and strong electric fields

Bárány

2015

Advances in Colloid and Interface Science

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“…(%). This indicates that the dispersant preferentially adsorbed onto ceramic particles rather than onto starch granules 21,23 . This is because the starch granules might electrostatically reject the dispersant due to its partially negative surface at the pH studied 30 .…”

Section: Rheological Characteristics Of Ceramic Slurries Loaded With mentioning

confidence: 99%

“…It can be observed that both slurries exhibit high sediment heights indicating unstability of the particle dispersion in the lower pH range. This unstability is attributed to an agglomeration of edge to face association of clay platelets 23 . The build up of such agglomerates is aggravated with the possible adsorption of quartz onto basal surfaces of clay platelets.…”

Section: Dispersion Behavior Of Red Clay-based Slurry Without Starchmentioning

confidence: 99%

Aqueous dispersion of red clay-based ceramic powder with the addition of starch

Umaran

Menchavez

2013

Mat. Res.

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The optimum dispersion and rheological properties of red clay-based ceramic suspension loaded with unary and binary starch were investigated in aqueous medium. The aqueous ceramic suspension was prepared consisting of red clay, quartz, feldspar, and distilled water. Using a polyelectrolyte dispersant (Darvan 821A), the ternary ceramic powder was initially optimized to give the smallest average particle size at 0.8 wt. (%) dispersant dosage as supported by sedimentation test. This resulted into an optimum high solid loading of 55 wt. (%). The addition of either unary or binary starches to the optimized ceramic slurry increased the viscosity but maintained an acceptable fluidity. The mechanism of such viscosity increase was found to be due to an adsorption of starch granules onto ceramic surfaces causing tolerable agglomeration. Correspondingly, the rheological evaluations showed that the flow behaviors of all starch-loaded ceramic slurries can be described using Herschel-Bulkley model. The parameters from this model indicated that all ceramic slurries loaded with starch are shear thinning that is required for direct casting process.

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Characterization of four different lignins as a first step toward the identification of suitable end‐use applications

Oveissi

Fatehi

2015

J of Applied Polymer Sci

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To determine the most appropriate use of lignin, surface, structural, and thermal characteristics of lignin was investigated in this work. It was observed that kraft lignin (KL), the lignin of prehydrolysis liquor (LPHL), lignosulfonate of NSSC process (LSL), and lignosulfonates (LSs) of sulfite pulping process had 0.67, 0.25, 0.90, and 1.52-2.25 meq/g anionic charge density, and 6.3, 2.1, 10.1, and 8.8-10.1 nm hydrodynamic diameter, respectively. These results suggested that LSL and LSs could be used more effectively than other lignin as filler modifiers, flocculants, and dispersants. The combustion studies of the lignin samples suggested that KL and LPHL combusted more efficiently than other samples, as they had high heating (calorific) values of 27.02 and 19.2 MJ/kg, the apparent activation energy of 126.64 and 99.14 kJ/mol based on Flynn-Wall-Ozawa method and 122.16 and 94.73 kJ/mol based on Kissinger-Akahira-Sunose and no ash, respectively. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42336.

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Effect of polyelectrolyte mixtures on the electrokinetic potential and kinetics of flocculation of clay mineral particles

Cited by 34 publications

References 21 publications

Polymer adsorption and electrokinetic potential of dispersed particles in weak and strong electric fields

Polymer adsorption and electrokinetic potential of dispersed particles in weak and strong electric fields

Aqueous dispersion of red clay-based ceramic powder with the addition of starch

Characterization of four different lignins as a first step toward the identification of suitable end‐use applications

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