Poly(acrylic acid)-Poly(ethylene oxide) Comb Polymer Effects on BaTiO 3 Nanoparticle Suspension Stability

Glen H. Kirby, Daniel J. Harris, Qi Li, Jennifer A. Lewis

Research output: Contribution to journalArticlepeer-review


We have studied the effects of poly(acrylic acid)-poly(ethylene oxide) (PAA-PEO) comb polymers on the stability of aqueous BaTiO 3, nanoparticle suspensions over a wide pH range in the presence and absence of mono- and divalent salt species. The comb polymer architecture consists of charge-neutral PEO teeth attached at random intervals along an ionizable PAA backhone. Potentiometric titrations, light scattering, and turbidity measurements were conducted on pure PAA and PAA-PEO solutions to assess their degree of ionization, radius of hydration, and stability. Adsorption isotherm and rheological measurements were conducted on BaTiO 3 nanoparticle suspensions to determine the effectiveness of both PAA and PAA-PEO dispersants. Our observations indicate that the presence of PEO teeth effectively shield the underlying PAA backhone from ion interactions, e.g., counterion-screening or ion-bridging effects, thereby allowing PAA-PEO dispersants to impart stability to BaTiO 3 nanoparticle suspensions over a wide range of pH, ionic strength, and ion valency conditions where pure PAA fails.

Original languageEnglish (US)
Pages (from-to)181-186
Number of pages6
JournalJournal of the American Ceramic Society
Issue number2
StatePublished - Feb 2004

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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