Abstract
The effects of molecular weight (MW) and concentration of polyacrylic acid (PAA) on the yield stress τ y of ZrO 2 suspensions were evaluated. The M w range studied was from 1656 to 750000. The effect of adsorbed polyelectrolyte on the forces between particles was determined by focussing on the pH at which zero zeta-potential (ζ=0) is observed in the presence and absence of polymer. At this ζ=0 condition a maximum in yield stress ( τ ymax) is observed. Low molecular weight PAA imposes a steric (repulsive) interaction energy which is gradually replaced by a bridging (attractive) energy as the molecular weight is increased. The shift in τ ymax and the pH at which ζ=0 both show systematic changes with M w as electrostatic, steric, van der Waals and bridging forces change in relative importance.
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