Rs. Pradip,"premachandran et Sg. Malghan, ELECTROKINETIC BEHAVIOR AND DISPERSION CHARACTERISTICS OF CERAMIC POWDERS WITH CATIONIC AND ANIONIC POLYELECTROLYTES, Bulletin of Materials Science, 17(6), 1994, pp. 911-920
Three different ceramic powders, viz. alumina, zirconia and silicon ni
tride were dispersed using two polyelectrolytes, one cationic (Betz 11
90) and the other anionic (Darvan-C). All powders examined during the
study could be well dispersed only under conditions of polymer dosage
and pH such that the working pH is at least 2 pH units away from the p
H(IEP) of the powder-dispersant combination. The shift in the isoelect
ric point (IEP) of the powders were determined through electro-acousti
c measurements on 1% volume suspensions. Specific free energy of inter
action were also computed using a model based on the electrical double
layer theory of surfactant absorption.