Dispersion stability of ultra-fine BaTiO3 suspensions in aqueous medium
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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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