Interface Adsorption Properties of Y-TZP Aqueous Suspensions

Yttria stabilized tetragonal zirconia(Y-TZP) suspensions were prepared by employing polyelectrolytes as dispersant. Isotherm adsorption and electrokinetic measurement of the suspensions suggested that surf are chemistry of the particles was affected by such adsorbed polymers asNH4PAA and the optimum concentration of the polymer dispersant was about 2wt%. The isoelectric point(IEP) of the suspension was shifted to low pH value. Interactions between particleswere measured by using atomic force microscopy(AFM). The polymer adsorbed particles showedenhanced repulsive force 3 times higher than that of unadsorbed Y-TZP particles. Scanning augermicroscopy(SAM) results showed that surface bond structure of particles was influenced by adsorbed polymers. Rheology tests also revealed that the viscosity reached its nadir at saturatedadsorption point, which was consistent with the conclusion drawn from isotherm adsorption.