カチオン性ポリ電解質を用いたセラミックス粉体スラリーの凝集挙動

凝集スラリーのレオロジー測定によるフロック間相互作用について

抄録

The interaction among flocs was discussed from the rheological properties of ceramic slurries as a function of the volume fraction of medium involving a polyelectrolyte in two stages of flocs formation. The results are summarized as follows:
In the stage of rapid flocs formation, the dominant factor is the volume fraction of the medium isolated from the slurry. Because the polymer breaks the network structure of particles trapping the medium, the interactions between the flocs and the medium separated by the polymer become lower than those among particles due to network structuring.
In the stage of moderate flocs formation, the dominant factor is the floc. Bacause the polymer makes the interparticle distance in a floc narrow by bridging, the interactions among the flocs become higher than those between the flocs and the medium.
Consequently, the interactions of the flocs and the medium and among the flocs at the two stages converge on the characteristic point of the volume fraction of the medium which may indicate the closest-packed structure of the flocs. The volume fraction of the medium at that point may correspond to the point of water content in a floc.