Electrokinetic properties of calcium aluminate hydrates

descriptionPublicationkeyboard_double_arrow_right Article 01 Apr 1978 Netherlands English Publisher:Springer Science and Business Media LLCJournal:Colloid and Polymer Science, volume 256, pages 369-374 (issn: 0303-402X, eissn: 1435-1536,

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Authors: Spierings, G.A.C.M.; Stein, H.N.;

doi: 10.1007/bf01544331

Electrokinetic properties of calcium aluminate hydrates

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Abstract

The surface charge of Ca3Al2(OH)12 in water and NaOH solutions is negative when the solution is saturated towards this compound. When Ca3A12(OH)12 is formed during the reaction of Ca3A12O6 with water and NaOH solutions a positive surface charge is present. This positive charge is also found for other hydrates existing during this reaction; it indicates a disturbed surface layer with excess Ca2+ ions on the solid. Further it was shown that the absolute value of the surface charge calculated with the change of the activity coefficient in the diffuse double-layer taken into account is smaller than calculated with the equation without this correction.

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Netherlands

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Technical University Eindhoven
Netherlands

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