Effect of Poly(Acrylic Acid) and Poly(Vinyl Alcohol) on the Solubility of Colloidal BaTiO3 in an Aqueous Medium

Published

May 1, 2003

Author(s)

S K. Lee, J. H. Lee, Vincent A. Hackley, U Paik

Abstract

The influence of poly (acrylic acid) PAA) and poly(vinyl alcohol) PVA) on Ba dissolution at the BaTiO₃-aqueous solution interface was investigated. Incongruent dissolution of Ba impacts the colloidal stability, microstructure and electrical properties of Ba TiO₃ and related perovskite dielectric materials used in the manufactuer of ceramic capacitors. The dissolution characteristics of BaTiO₃ were influenced significantly by the presence of PAA and PVA. PAA, which forms weak monodenate complexes with Ba²⁺, acted as both a passivating and a sequestering agent, depending on pH. Both PAA and PVA provided some degree of passivation in the acidic pH region. Above pH8, where BaTiO₃ solubility decreases sharply, PVA had a moderate passivating effect, whereas solubility was enhanced by PAA with a positive linear dependence on concentration. The adsorptive and electrokinetic behavior of colloidal BaTiO₃ with respect to PAA and PVA are correlated with the observed passivating and sequestering properties of these polymers.

Citation

Journal of Materials Research

Volume

18

Issue

No. 5

Pub Type

Journals

Keywords

adsorption, barium titanate, colloids, dissolution, electrokinetics, passivation, poly (acrylic acid, poly(vinyl alcohol), sequestration

Citation

Lee, S. , Lee, J. , Hackley, V. and Paik, U. (2003), Effect of Poly(Acrylic Acid) and Poly(Vinyl Alcohol) on the Solubility of Colloidal BaTiO₃ in an Aqueous Medium, Journal of Materials Research (Accessed September 10, 2024)