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Dispersion stability of ultra-fine BaTiO3 suspensions in aqueous medium

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2005, 15(6), pp.239-243
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

전명표 1 Cho Jeong Ho 2 마용준 3 정용빈 4 KIM BYUNG IK 2

1요업기술원
2한국세라믹기술원
3세라트론
4서울대학교

Accredited

ABSTRACT

The effect of pH and particle size on the dispersion stability of ultra-fine BaTiO3 suspensions in aqueous medium have been investigated by means of zeta potential, sediment experiments, and powder properties (particle analysis, specific surface area) etc. Zeta potential as a function of pH for two particles of different size increases from -75 to +10 mV with decreasing pH from 8.5 to 1.4. The curve of zeta potential for small particle (150 nm) has slow slope than that of large particle (900 nm), giving IEP (isoelectric point) value of pH = 1.6 for small particle and pH = 1.9 for large particle respectively, which means that it is more difficult to control zeta potential with pH for small particle than large particle. The dispersion stability of BaTiO3 particles in aqueous medium was found to be strongly related with the agglomeration of colloidal suspensions with time through the sedimentation behaviors of colloidal particles with time and pH value.

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