Surface Potential Behavior of Nano <TEX>$CeO_2$</TEX> Particles in Aqueous Media

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J. Korean Ceram. Soc. > Volume 37(7); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(7): 721.

수계분산매체에서 나노 $CeO_2$ 입자의 계면전위 거동

이태원, 백운규, 최성철, 이상훈¹, 임형섭², 김철진³

한양대학교 세라믹공학과
¹대한광업진흥공사
²(주)석경화학
³경상대학교 무기재료공학과

Surface Potential Behavior of Nano $CeO_2$ Particles in Aqueous Media

ABSTRACT

In this study, the dispersion stability of nano-sized CeO2 particles, synthesized by hydrothermal method in aqueous was evaluated from observing the surface potential behavior of CeO2 particle synthesized by solid state reaction. The isoelectric point(IEP) of nano-sized CeO2 synthesized by hydrothermal synthesis was found to be pH 9 contrary to the isoelectric point of micro-sized CeO2 synthesized by solid state reaction at pH 6.7. IEP was shifted to pH 2.0 as the addition of D-3019 from 0.1 to 1.0 wt%. The surface potential of CeO2 particles synthesized by hydrothermal synthesis was reduced as the addition of B-1001 used as a binder without change of IEP because the absorption of B-1001 polymer on the CeO2 particles shifted the shear plane of CeO2 particles outward away from the surface. This surface potential behavior was well correlated with the dispersion stability of slurry.

Key words: Surface potential, ESA, Isoelectric point, Dispersion stability