Dispersion of barium titanate in aqueous media

Four kinds of dispersants including poly(acrylic acid-co-maleic acid), poly-dl-aspartic acid, polyacrylic acid and ammonium citrate were chosen from more than seventy kinds of dispersants by screening experiments concerning their dispersing abilities for barium titanate (BT) suspension in aqueous media. Sediment experiments, rheology characterization and particle distribution measurements were conducted through orthogonal experiments. The optimum concentrations of dispersants, pH value and ball-milling time have been obtained. Judging from the results of both rheological behavior and particle distribution curves, we can conclude that the best effective dispersant for BT particles in aqueous media is poly(acrylic acid-co-maleic acid), while the least effective one is ammonium citrated among these four kinds of dispersants.