Title: Influence of ammonium salt of poly-methacrylic acid and butylamine addition on the viscosity and electrophoretic deposition behavior of ethanol-based powder suspensions
Authors: Popa, Ana Maria ×
Vleugels, Jef
Vermant, Jan
Van der Biest, Omer #
Issue Date: Oct-2005
Publisher: Elsevier science bv
Series Title: Colloids and Surfaces A, Physicochemical and Engineering Aspects vol:267 issue:1-3 pages:74-78
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 mu l/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 mu l/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. (c) 2005 Elsevier B.V. All rights reserved.
ISSN: 0927-7757
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physical Metallurgy and Materials Engineering Section (-)
Soft Matter, Rheology and Technology Section
× corresponding author
# (joint) last author

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