Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Dispersion stability of ultra-fine $BaTiO_3$ suspensions in aqueous medium

  • Chun, M.P. (Advanced Materials and Components Lab., Korea institute of Ceramic Engineering and Technology) ;
  • Chung, Y.B. (Advanced Materials and Components Lab., Korea institute of Ceramic Engineering and Technology) ;
  • Ma, Y.J. (Advanced Materials and Components Lab., Korea institute of Ceramic Engineering and Technology) ;
  • Cho, J.H. (Advanced Materials and Components Lab., Korea institute of Ceramic Engineering and Technology) ;
  • Kim, B.I. (Advanced Materials and Components Lab., Korea institute of Ceramic Engineering and Technology)
  • Published : 2005.12.31
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Abstract

The effect of pH and particle size on the dispersion stability of ultra-fine $BaTiO_3$ 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 (900nm), 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 fur small particle than large particle. The dispersion stability of $BaTiO_3$ 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.

Keywords

References

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