Dispersion mechanisms in aqueous alumina suspensions at high solids loadings

Palmqvist, Lisa; Lyckfeldt, Ola; Carlström, Elis; Davoust, Per; Kauppi, Annika; Holmberg, Krister

doi:10.1016/j.colsurfa.2005.08.039

Cited by 60 publications

(49 citation statements)

References 26 publications

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“…These limitations can be reduced by the recourse to copolymers issued from the polymerization of at least two monomers, one of which has an ionic or ionizable group that impart adsorption and the other is a nonionic structures, such as polyethylene glycol or polypropylene glycol, dangling freely in the solvent which makes steric stabilization possible through an expanded configuration. The use of copolymers, namely those with a comb-like architecture for aqueous processing of colloidal dispersion has not yet been fully explored, and only few studies have been reported [9,10,[17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Dispersion of alumina suspension using comb-like and diblock copolymers produced by RAFT polymerization of AMPS and MPEG

Bouhamed

Boufi

Magnin

2007

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Dispersion of alumina suspension using comb-like and diblock copolymers produced by RAFT polymerization of AMPS and MPEG

Bouhamed

Boufi

Magnin

2007

Journal of Colloid and Interface Science

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“…As a result particle/ particle interactions can occur and this is why P58E gave a higher carbon black dispersion viscosity than P41E. Similarly, Palmqvist et al 13 attributed a high dispersion viscosity observed for a grafted polymer in alumina to a high effective volume fraction. The adsorption layer thickness for P41E is about 6.11 nm, compared to a theoretical value of 14.35 nm (length of each EO unit is about 0.35 nm).…”

Section: Optimization Of Polyetheralkanolaminesmentioning

confidence: 95%

“…Using photon correlation spectroscopy, the adsorbed polymer layer thickness was found to increase with the molecular weight of polyethylene glycol at TiO 2 /water interface. 8 Recently, using equation (5) above, Palmqvist et al 13 calculated the layer thickness of 33.5 nm for a comb polymer consisting of a polycarboxylate backbone with PEO chains. For / = 0.24, the / eff for P58E is about 0.64 which is close to the maximum packing limit of 0.74 for hexagonal close packing.…”

Section: Optimization Of Polyetheralkanolaminesmentioning

confidence: 99%

“…The authors did not indicate if these copolymers would be effective for organic pigments and carbon black. A poly(acrylic acid), a lignosulphonate, and a comb polymer (consisting of a polycarboxylate backbone modified with sulphonate groups and grafted polyoxyethylene chains) as dispersants for highly concentrated aqueous alumina suspensions have been investigated by Palmqvist et al 13 At pH of 10, a poly(acrylic acid) was the most effective dispersant, providing both electrostatic and steric stabilizations. Schwartz et al 14 examined an acrylic/polyether comb-branched copolymer as a dispersant for inkjet inks.…”

Section: Introductionmentioning

confidence: 99%

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Use of novel polyetheralkanolamine comb polymers as pigment dispersants for aqueous coating systems

Nguyen

2007

J Coat Technol Res

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The adsorption of a series of polyetheralkanolamine comb polymers characterized by a different length of the hydrophilic tail has been investigated at the carbon black/water interface by measuring adsorption isotherm, contact angle, wetting rate, zeta potential, and particle size distribution. Zeta potential measurements and adsorption layer thickness results suggest that polyetheralkanolamines with high ethylene oxide (EO) content provide only steric stabilization and they adsorb at the interface with the ethylene oxide chains in a coil conformation. The thickness of the adsorbed layer increases with increasing EO units; however, the surface tension and interfacial tension decrease with increasing EO content. Adsorption isotherms show that most of the added polyetheralkanolamine adsorbs onto the carbon black and only a small amount stays in the water phase. When treated with a polyetheralkanolamine, carbon black dispersions show uniform (unimodal) and narrow particle size distribution with very small median sizes of about 0.10 lm. The pigment concentrates containing the polyetheralkanolamine show excellent color compatibility in various decorative commercial white paints containing a wide range of resins and exhibit low viscosity with nearly Newtonian flow behavior.

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“…Moreover, suspensions with high solid loading produce high wet and green strength that facilitate easy mold release and drying. These properties are essential in advance fabrication techniques such as gelcasting and starch consolidation, where no drainage of water takes place 11 . Currently, the starch consolidation has become a competitive shaping technique owing to its environmentalfriendly process and economic viability.…”

Section: Introductionmentioning

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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Dispersion mechanisms in aqueous alumina suspensions at high solids loadings

Cited by 60 publications

References 26 publications

Dispersion of alumina suspension using comb-like and diblock copolymers produced by RAFT polymerization of AMPS and MPEG

Dispersion of alumina suspension using comb-like and diblock copolymers produced by RAFT polymerization of AMPS and MPEG

Use of novel polyetheralkanolamine comb polymers as pigment dispersants for aqueous coating systems

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

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