Surface Characterization of NH4PAA-Stabilized Zirconia Suspensions

✍ Scribed by Jun Wang; Lian Gao; Jing Sun; Qiang Li

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 232 KB
• Volume: 213
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1999.6138

✦ Synopsis

Ammonium polyacrylate (NH 4 PAA) stabilized yttria-doped (3 mol%) tetragonal zirconia (Y-TZP) aqueous suspensions were prepared. Surface chemistry of the suspension was investigated by a variety of techniques. Isotherm adsorption of dispersants on ZrO 2 particles demonstrated an optimum coverage of 0.25 mg/g at pH 10. The isoelectric point (IEP) of ZrO 2 suspensions was shifted to low pH regions with the presence of NH 4 PAA. Scanning auger microscopy (SAM) and FTIR and UV spectrophotometry were employed to determine the surface properties of ZrO 2 suspensions, which confirmed that the surface Zr-O bonds were affected by the adsorbed polymers. Atomic force microscopy (AFM) analysis indicated that the interactions between particles were evidently influenced by polymer dispersants.