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Analysis of hetero-coagulation structure of colloidal mullite precursor powder - experimental approach and computer simulation -

Published online by Cambridge University Press:  10 February 2011

Y. I. Cho ,
H. Kamiya ,
H. Takano ,
M. Horio  and
H. Suzuki
Y. I. Cho
Affiliation:
Tokyo University of Agriculture and Technology, Graduate School of Bio-Application and System Engineering, Koganei, Tokyo, 184 Japan
H. Kamiya
Affiliation:
Tokyo University of Agriculture and Technology, Graduate School of Bio-Application and System Engineering, Koganei, Tokyo, 184 Japan
H. Takano
Affiliation:
Tokyo University of Agriculture and Technology, Graduate School of Bio-Application and System Engineering, Koganei, Tokyo, 184 Japan
M. Horio
Affiliation:
Tokyo University of Agriculture and Technology, Graduate School of Bio-Application and System Engineering, Koganei, Tokyo, 184 Japan
H. Suzuki
Affiliation:
Shizuoka University, Dept of Materials Science, Hamamatsu, Shizuoka, 432 Japan
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Abstract

To control the hetero-coagulation structure of ultra-fine γ-A12O3 and SiO2 powders for mullite ceramics, hetero-coagulation structures in suspensions with different pH conditions were investigated by experimental approach and computer simulation. Electrophoretic mobility distribution, which was determined by a Laser Doppler method, was used for the estimation of hetero-coagulation structure. As results, a bimodal electrophoretic mobility distribution was observed when precursor powders were prepared by colloidal mixing processes at pH=9.5. Since each peak almost corresponded to the electrophoretic mobility of γ-A12O3 or SiO2 particles, hetero-coagulates were not formed in suspension. In the case of pH=6.0, heterocoagulates generated in suspension, however, uniform and fine hetero-coagulates could not be attained. On the other hand, narrow and single mode electrophoretic mobility distribution was observed after colloidal mixing at pH=4.4. The change of hetero-coagulation structure with different pH conditions were analyzed by using Brownian dynamic methods with considering hetero-coagulated system. The change of hetero-coagulation structure with different pH conditions were qualitatively simulated by this model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 501: Symposium FF – Surface Controlled Nanoscale Materials for High-Added… , 1997 , 255
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

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