Effects of three dispersants on stability of ITO suspension

The effects of three dispersants(PVP,Triammonium citrate,β-Alanine) on the stability of ITO suspension prepared by ball milling dispersion were studied.The influences of dispersing time and dispersant content on stability of ITO suspension were investigated.And the roles of the different dispersant and their dispersing mechanism on stability of ITO suspension were also investigated.The results show that the stability and dispersion mechanisms of the three dispersants are electrostatic and steric hindrance,and make ITO suspension keep RSH10% within 15 days under the conditions that the dispersant/ITO powder is 5%(mass ratio) and optimal ball milling dispersion time is 48 h.The sequence of effects of these three dispersants on the stability of ITO suspension is PVPβ-alaninetriammonium citrate,which is in agreement with the sequence of their acidity and alkalinity in the suspension.Among these three dispersants,PVP is the best one for the stability of ITO suspension.