Effect of pH on the Dispersion Stability of Aqueous Ferric Oxide Suspension |
| Journal |
Materials Science Forum (Volumes 544 - 545) |
| Volume |
Eco-Materials Processing and Design VIII |
| Edited by |
Hyungsun Kim, Junichi Hojo and Soo Wohn Lee |
| Pages |
717-720 |
| DOI |
10.4028/www.scientific.net/MSF.544-545.717 |
| Online since |
May, 2007 |
| Authors |
C.H Lee, Eun Hee Lee |
| Keywords |
Dispersant, Ferric Oxide, Poly(acrylic acid), Suspension, Zeta Potential |
| Abstract |
We have studied the effect of pH on the dispersion stability of aqueous suspensions of
Fe2O3 powders over a wide pH range in the presence of the poly (acrylic acid) (PAA). In order to
investigate the ionization behavior of the PAA, pH of PAA solutions was measured. Sedimentation
and zeta-potential measurements were conducted on aqueous Fe2O3 suspensions to characterize the
dispersion stability of the suspensions. The PAA was ionized over a wide pH range and the quantity of
ionization was abruptly increased at pH > 10. Thus, the dispersion of the Fe2O3 powders was observed
even in acidic solutions and the dispersion stability of the suspensions increased as pH of the solutions
increased. The magnitude of zeta-potential values increased with increasing pH. |
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