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Rapid Electroacoustic Method for Monitoring Dispersion: Zeta Potential Titration of Alumina with Ammonium Poly(methacrylate)
Author(s) -
Beattie James K.,
Djerdjev Alex
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01561.x
Subject(s) - zeta potential , microelectrophoresis , isoelectric point , dispersion (optics) , methacrylic acid , titration , ammonium , viscosity , materials science , conductometry , particle size , analytical chemistry (journal) , coagulation , chemical engineering , chemistry , chromatography , polymer , electrophoresis , composite material , nanotechnology , nanoparticle , inorganic chemistry , copolymer , organic chemistry , optics , physics , engineering , enzyme , psychology , psychiatry
The zeta potential (ζ) of 2‐vol% and 10‐vol% suspensions of a commercial α‐alumina has been measured using the electroacoustic technique and found to be in good agreement with values reported previously from microelectrophoresis measurements. An increasingly negative ζ value was observed through semiautomatic addition of solutions of a ammonium salt of poly(methacrylic acid). The point of complete surface coverage was inferred from simultaneous conductivity measurements. The average particle size obtained from the electroacoustic dynamic mobility spectrum showed the effect of coagulation near the isoelectric point. The expected correlations among ζ, the viscosity, and the sedimentation volume were observed. The results illustrate the efficacy of the electroacoustic technique for examining colloidal dispersions.