Rapid electroacoustic method for monitoring dispersion: Zeta potential titration of alumina with ammonium poly(methacrylate)

Citation
Jk. Beattie et A. Djerdjev, Rapid electroacoustic method for monitoring dispersion: Zeta potential titration of alumina with ammonium poly(methacrylate), J AM CERAM, 83(10), 2000, pp. 2360-2364
Citations number
12
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN journal
00027820 → ACNP
Volume
83
Issue
10
Year of publication
2000
Pages
2360 - 2364
Database
ISI
SICI code
0002-7820(200010)83:10<2360:REMFMD>2.0.ZU;2-Q
Abstract
The zeta potential (zeta) of 2-vol% and 10-vol% suspensions of a commercial alpha-alumina has been measured using the electroacoustic technique and fo und to be in good agreement with values reported previously from microelect rophoresis measurements. An increasingly negative zeta value was observed t hrough semiautomatic addition of solutions of a ammonium salt of poly(metha crylic acid). The point of complete surface coverage was inferred from simu ltaneous conductivity measurements. The average particle size obtained from the electroacoustic dynamic mobility spectrum showed the effect of coagula tion near the isoelectric point. The expected correlations among zeta, the viscosity, and the sedimentation volume were observed. The results illustra te the efficacy of the electroacoustic technique for examining colloidal di spersions.