Abstract
The interactions between colloidal particles play a major role in
processing of ceramics, especially in casting processes. With the
Atomic Force Microscope (AFM) it is possible to measure the
inter-action force between a small oxide particle (a few micron)
and a surface as function of surface separation. Force
measurements between a-Al2O3 and TZ3Y surfaces in aqueous
solutions has been performed. These data corre-sponds well to the
DLVO (Derjaguin, Landau, Vervey and Overbeek) theory for
surface-interaction. The derived results are in the form of an
apparent surface potential, which show a strong dependency of the
pH-value as ex-pected - ranging from + 110 mV at pH 5.6 to - 30 mV
at pH 9.5 for a-Al2O3 and + 70 mV at pH 3 to 10 mV at pH 5.6 for
TZ3Y. The numerical highest potential values are obtained for the
lowest salt concentrations in solution. The values for the surface
potentials can be compared to zeta-potentials measured on powders
of the same materials.
| Original language | English |
|---|---|
| Title of host publication | Proceedings from Nordic Ceramic ´96 |
| Publisher | Norwegian Ceramic Society |
| Publication date | 1996 |
| Pages | 1-100 |
| Publication status | Published - 1996 |