The Korean Journal of Ceramics

The Korean Ceramic Society (한국세라믹학회)
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Dispersion of Aqueous $Al_2O_3$Suspensions with Electrolytes; Influence of the Counter Ion

  • Cecile Pagnoux (Laboratoire des Sciences des Procedes Ceramiques et de Traitements de Surface) ;
  • Richard Laucournet (Laboratoire des Sciences des Procedes Ceramiques et de Traitements de Surface) ;
  • Thierry Chartier (Laboratoire des Sciences des Procedes Ceramiques et de Traitements de Surface) ;
  • Baumard, Jean-Francois (Laboratoire des Sciences des Procedes Ceramiques et de Traitements de Surface)
  • Published : 2000.09.01
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Abstract

The electrolyte, $(HO)_2C_6H_2(SO_3Na)_2H_2O $(Tiron), disperses efficiently alumina powder in aqueous media and stable suspensions with 60 vol% solid loading can be prepared. The strong adsorption of this additive is mainly due to the ability of the molecule to form chelate rings with the particle surface but electrostatic interactions between the surface charge and the anionic dispersant strongly influence the amount of Tiron adsorbed. By using a cationic exchange route to substitute the counter ion which neutralizes the sulfonate groups, new molecules of dispersant have been prepared, either with mineral cations as $Li^+,\; Na+^,\; NH_4^\;+$, or with organic cations as counter ion but organic counter ions lead to less to less viscous suspensions than $Na^+$ in particular when the number of carbon atoms of the aliphatic chain increases from 1 to 3.

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