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Interaction of Organic Additives With Ceramic Surfaces In Colloidal Slurries

Published online by Cambridge University Press:  10 February 2011

W. M. Sigmund ,
L. Wang ,
J. Sindel ,
M. Rotov  and
F. Aldinger
W. M. Sigmund
Affiliation:
University of Stuttgart, Institut für Nichtmetallische Anorganische Materialien, 70569 Stuttgart, Germany, sigmund@aldix.mpi-stuttgart.mpg.de
L. Wang
Affiliation:
University of Stuttgart, Institut für Nichtmetallische Anorganische Materialien, 70569 Stuttgart, Germany, sigmund@aldix.mpi-stuttgart.mpg.de
J. Sindel
Affiliation:
University of Stuttgart, Institut für Nichtmetallische Anorganische Materialien, 70569 Stuttgart, Germany, sigmund@aldix.mpi-stuttgart.mpg.de
M. Rotov
Affiliation:
University of Stuttgart, Institut für Nichtmetallische Anorganische Materialien, 70569 Stuttgart, Germany, sigmund@aldix.mpi-stuttgart.mpg.de
F. Aldinger
Affiliation:
University of Stuttgart, Institut für Nichtmetallische Anorganische Materialien, 70569 Stuttgart, Germany, sigmund@aldix.mpi-stuttgart.mpg.de
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Abstract

Three different dispersants, a low molecular weight compound (aminoalkanol), a polymer (polyelectrolyte) and a block-co-polymer (block polyethylenoxide-polyacrylic acid) were investigated with AFM and rheology in an aqueous system in order to elucidate the influence of the size and structure of the molecule on the dispersion stabilization. The AFM studies indicate that the aminoalkanol gives repulsive forces due to electrostatic repulsion only. The polyelectrolyte seems to stabilize the dispersion with both steric and electrostatic repulsive forces. A new compound that was designed for pure steric stabilization in aqueous media a block-co-polymer consisting of a polar anchor block and a stabilizing neutral chain was investigated for its behavior. The AFM measurements show that it is likely that this compound causes repulsion of silicon nitride surfaces due to steric repulsion only. Rheological measurements of aqueous powder slurries show that the adsorption of the organic additives is of great importance. Due to a more silicon dioxide like acidic surface of the investigated Si3N4 - powder the carboxylate anions of the block-co-polymer adsorb badly. Therefore, no sterically repulsive forces can be built up. This then causes an increase in the slurry's viscosity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 432: Symposium S – Aqueous Chemistry and Geochemistry of Oxides , 1996 , 339
Copyright
Copyright © Materials Research Society 1997

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References

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2. Sigmund, W. M., PhD thesis, Max-Planck-Institute for Polymer Research and Johannes Gutenberg-University in Mainz, Germany, 1992.Google Scholar
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