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

Hsin Hsuan Wu, Kung Chung Hsu

研究成果: 雜誌貢獻文章

2 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
頁(從 - 到)1082-1088
頁數7
期刊Journal of Applied Polymer Science
101
發行號2
DOIs
出版狀態已發佈 - 2006 七月 15

ASJC Scopus subject areas

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

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