TY - JOUR
T1 - An electroacoustic investigation of concentrated aqueous suspensions of calcium pyrophosphate
AU - Greenwood, Richard
PY - 2004/12/1
Y1 - 2004/12/1
N2 - The zeta potential of concentrated suspensions of calcium pyrophosphate were investigated using electro-acoustics. The particles were negatively charged over the entire pH range studied. It proved impossible to reduce the pH of the suspension below 1.8, but the iso electric point could be estimated to occur at approximately pH 1. Two commercially available dispersants (one cationic and one anionic) were then added in small increments to the suspension in order to follow the change in zeta potential as the dispersants adsorbed onto the particles. From the shape of the curve it was possible to estimate the optimum adsorbed amount of dispersant required to fully coat the particles. The cationic dispersant adsorbed strongly and the optimum dosage was estimated at 2.5 ml of active polymer/kg of powder. Anionic dispersants are known to adsorb onto negatively charged ceramic oxide particles, but the anionic dispersant used in this study did not adsorb onto the negatively charged calcium pyrophosphate particles.
AB - The zeta potential of concentrated suspensions of calcium pyrophosphate were investigated using electro-acoustics. The particles were negatively charged over the entire pH range studied. It proved impossible to reduce the pH of the suspension below 1.8, but the iso electric point could be estimated to occur at approximately pH 1. Two commercially available dispersants (one cationic and one anionic) were then added in small increments to the suspension in order to follow the change in zeta potential as the dispersants adsorbed onto the particles. From the shape of the curve it was possible to estimate the optimum adsorbed amount of dispersant required to fully coat the particles. The cationic dispersant adsorbed strongly and the optimum dosage was estimated at 2.5 ml of active polymer/kg of powder. Anionic dispersants are known to adsorb onto negatively charged ceramic oxide particles, but the anionic dispersant used in this study did not adsorb onto the negatively charged calcium pyrophosphate particles.
UR - http://www.scopus.com/inward/record.url?scp=12344325881&partnerID=8YFLogxK
U2 - 10.1002/ppsc.200400949
DO - 10.1002/ppsc.200400949
M3 - Article
SN - 1521-4117
VL - 21
SP - 415
EP - 418
JO - Particle & Particle Systems Characterization
JF - Particle & Particle Systems Characterization
ER -