Effect of pH on the properties of barium titanate slurries with an aniomic dispersant

Hsin Hsuan Wu, Kung Chung Hsu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The colloidal stability of barium titanate (BT) aqueous suspensions with poly(acrylamide/4-carboxylamino-4-oxo-2-butenate) (PAAM/COB) at pH 7, 9, and 12 has been investigated by means of ζ potential, adsorption, sedimentation, and particle size measurements. The isoelectric point of BT powder is at pH 4.6 and the value of ζ potential decreases as the pH of suspensions increases. The adsorption of PAAM/COB onto BT particles follows the Langmuir adsorption isotherm. The saturated amount of adsorbed polymer decreases with increasing pH. In general, BT particles in basic solutions with PAAM/COB are more stabilized, and less agglomerated than those without any dispersant present. As pH is increased, the resulting ζ potential becomes more negative, although lower polymer concentration is required for monolayer coverage of particle surface. Consequently, the resulting suspensions become more stabilized, and contain powder with smaller particle size.

Original languageEnglish
Pages (from-to)1082-1088
Number of pages7
JournalJournal of Applied Polymer Science
Volume101
Issue number2
DOIs
Publication statusPublished - 2006 Jul 15

Keywords

  • Adsorption
  • Ba-TiO
  • Dispersion
  • PAAM/COB
  • pH

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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