Paper Title:

Effect of pH on the Dispersion Stability of Aqueous Ferric Oxide Suspension

Periodical Materials Science Forum (Volumes 544 - 545)
Main Theme 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
Citation C.H Lee et al., 2007, Materials Science Forum, 544-545, 717
Online since May 2007
Authors C.H Lee, Eun Hee Lee
Keywords Dispersant, Ferric Oxide, Poly(Acrylic Acid), Suspension, Zeta-Potential
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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.