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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

1. Suzuki, H., Tomokiyo, Y., Suyama, Y. and Saito, H., J. Ceram. Soc., Jpn, p 67 (1988).Google Scholar
2. Kamiya, H., Suzuki, H., Ichikawa, T., Cho, Y-I and Horio, M., J. Am. Ceram. Soc., in press (1977).Google Scholar
3. Shin, W. Y., Shin, W. H. and Aksay, I. A., J. Am. Ceram. Soc., 79, p 2587 (1996).Google Scholar
4. Cho, Y. I., Kamiya, H., Suzuki, Y., Horio, M. and Suzuki, H., J. Ceram. Soc. Jpn., in press (1998)Google Scholar
5. Kamiya, H., Suzuki, H., Kato, D. and Jimbo, G., J. Am. Ceram. Soc., 76, p 54 (1993).Google Scholar
6. Kamiya, H., Mitsui, M., Miyazawa, S., Takano, H. and Horio, M., J. Am. Ceram. Soc., submittedGoogle Scholar