Study of processing adsorption mechanism of amphoteric polyelectrolyte in BaTiO3 colloids suspension

Bang Ying Yu, Wen Cheng J. Wei, Kung-Chung Hsu

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Abstract

An amphoteric dispersant, copolymer (α-N,N-dimethyl-N- acryloyloxyethyl) ammonium ethanateacrylamide (PAAM/DAAE), was used for the dispersion of BaTiO3 (BT) colloids in an aqueous solution, and compared to a commercial acrylic-based polymeric dispersant, ammonium salt of polymethylacrylic acid (PMAA-NH4). Several properties, including surface potential, sedimentation height ratio, green density, and Ba 2+ dissolution from the particle surface were studied. Due to the branch structure of PAAM/DAAE and more importantly the amphoteric functional groups of PAAM/DAAE, the macromolecules adsorbed on BT in much higher concentration (up to 7 mg/g) and limited the dissolution of Ba2+ ions from the BT surface. Strong steric repulsion between BT particles with PAAM/DAAE resulted in a good dispersion of fine particles and greater packing density in the green state than that of PMAA-NH4. The adsorption mechanism and interactions among BT, dispersants, and H2O are reported.

Original languageEnglish
Pages (from-to)163-170
Number of pages8
JournalJournal of Ceramic Processing Research
Volume5
Issue number2
Publication statusPublished - 2004 Aug 27

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Keywords

  • Adsorption
  • Ba dissolution
  • Colloid
  • Dispersant
  • PAAM/DAAE
  • ζ-potential

ASJC Scopus subject areas

  • Ceramics and Composites

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