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Dispersion of kaolin powders in silica sols

Zhang, Zhi / Lu, Xuchen / Su, Peng

AbstractThe dispersion properties of kaolin powders in silica sols were investigated by electrokinetic, viscosity and rheological measurements. Silica sol improved the dispersion of kaolin powders by increasing the negative charges on kaolinite particles. Electrophoretic mobility and viscosity of the kaolin particles in silica sol changed significantly in comparison with dispersions in deionized water. The kaolinite particles in silica sol showed a maximum of the electrophoretic mobility and a minimum in viscosity around pH 11.5. The viscosity of the dispersion reached a minimum when the silica sol concentration was 5mass%. The flow behavior was non-Newtonian showing shear-thinning. When the solid content exceeded 45mass%, the dispersion showed pronounced thixotropic behavior.

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Dispersion of kaolin powders in silica sols

Zhang, Zhi / Lu, Xuchen / Su, Peng

AbstractThe dispersion properties of kaolin powders in silica sols were investigated by electrokinetic, viscosity and rheological measurements. Silica sol improved the dispersion of kaolin powders by increasing the negative charges on kaolinite particles. Electrophoretic mobility and viscosity of the kaolin particles in silica sol changed significantly in comparison with dispersions in deionized water. The kaolinite particles in silica sol showed a maximum of the electrophoretic mobility and a minimum in viscosity around pH 11.5. The viscosity of the dispersion reached a minimum when the silica sol concentration was 5mass%. The flow behavior was non-Newtonian showing shear-thinning. When the solid content exceeded 45mass%, the dispersion showed pronounced thixotropic behavior.

Dispersion of kaolin powders in silica sols

Zhang, Zhi / Lu, Xuchen / Su, Peng

AbstractThe dispersion properties of kaolin powders in silica sols were investigated by electrokinetic, viscosity and rheological measurements. Silica sol improved the dispersion of kaolin powders by increasing the negative charges on kaolinite particles. Electrophoretic mobility and viscosity of the kaolin particles in silica sol changed significantly in comparison with dispersions in deionized water. The kaolinite particles in silica sol showed a maximum of the electrophoretic mobility and a minimum in viscosity around pH 11.5. The viscosity of the dispersion reached a minimum when the silica sol concentration was 5mass%. The flow behavior was non-Newtonian showing shear-thinning. When the solid content exceeded 45mass%, the dispersion showed pronounced thixotropic behavior.

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Title:

Dispersion of kaolin powders in silica sols

Contributors:

Zhang, Zhi (author) / Lu, Xuchen (author) / Su, Peng (author)

Published in:

Applied Clay Science ; 49 ; 51-54

Publication date:

2010-04-01

Size:

4 pages

ISSN:

DOI:

https://doi.org/10.1016/j.clay.2010.04.001

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Kaolin , Silica sol , Dispersion , Rheology

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