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
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.