Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9675631 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2005 | 5 Pages |
Abstract
Ethanol-based Al2O3 and Ce-ZrO2 suspensions are stabilized with ammonium poly-methacrylate (Darvan-C) and n-butylamine. The effect of the additives on the suspension stability is studied by zeta potential and viscosity measurements. When n-butylamine is added to the particles dispersed in ethanol, the suspension is electrostatically stabilized, the viscosity decreases and a shear-thinning behavior is observed. The suspensions stabilized with Darvan-C have a low Newtonian viscosity at concentrations above 140 μl/g. The polyelectrolyte is a more efficient dispersant than the organic base due to electrosteric stabilization. When the suspension is stabilized with n-butylamine prior to Darvan-C addition, stable suspensions are obtained when the n-butylamine or Darvan-C concentration is kept low. The wet deposit obtained from the suspensions stabilized with different BA concentrations and more than 100 μl/g of Darvan-C deforms under its own weight. When Darvan-C is adsorbed on the particles prior to n-butylamine addition, the suspensions have a low viscosity and a Newtonian behavior and the wet EPD deposit is smooth and rigid.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Colloid and Surface Chemistry
Authors
A.M. Popa, J. Vleugels, J. Vermant, O. Van der Biest,