Stabilization of Al2O3 dispersed slurry by controlling pH

This study delves into the critical role of pH in modulating the dispersion and stabilization characteristics of Al2O3 slurries, emphasizing the interaction between the dispersant and Polyvinyl Alcohol (PVA) binder in terms of the system's adsorption behaviors and stability parameters. Zeta-potential measurements elucidate the substantial impact of slurry pH on stability, correlating low zeta potential values with accelerated sedimentation rates. Thermogravimetric and Fourier-Transform Infrared Spectroscopy (FTIR) analyses are conducted to elucidate the co-adsorption dynamics of the dispersant and binder on the Al2O3 surface. Our findings highlight pronounced adsorption of the polymer below the isoelectric point (IEP) of slurry and demonstrate the preferential adsorption of the ionic dispersant over the binder, indicative of chemical bond formation with the former and hydrogen bonding with the latter. These results not only shed light on the interaction mechanisms between the particles and reagents in the system but also pave the way for optimizing slurry formulations for enhanced stability and performance in industrial applications.