| Project/Area Number |
10650662
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
KAMIYA Hidehiro Tokyo University of Agriculture and Technology, Department of Bio Applications and Systems Engineering, Associate Professor, 大学院・生物システム応用科学研究科, 助教授 (20183783)
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| Co-Investigator(Kenkyū-buntansha) |
HORIO Masayuki Tokyo University of Agriculture and Technology, Department of Bio Applications and Systems Engineering, Professor, 大学院・生物システム応用科学研究科, 教授 (40109301)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1998: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | surface modification / silica / alumina / silicon carbide / aggregation and dispersion / DLVO theory / electrosretic repulsion / polymer dispersant / SiC |
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| Research Abstract |
In order to prepare high performance and high reliability ceramics, it is necessary to avoid the irregular aggregate structure in their original ceramic slurries before green compact formation. In order to control the aggregation structure of ceramic powders in slurry, polymer dispersants are generally added. However, since the mechanism of polymer dispersants adsorbed on powder has not been clarified, the amount and molecular structure of polymer dispersant (hydrophobic to hydrophilic ratio, e.g.), pH, counter-ion concentration to obtain the minimum suspension viscosity have been often decided by an empirical approach.
In this work the systems of the powder of silica, alumina, silicon nitride with and without metal oxide additives and silicon carbide have been chosen to clarify the action mechanism of polymer dispersant in dense suspension and to correlate the macroscopic suspension viscosity and microscopic surface interaction between particles measured by an atomic force microscopy (AFM).
The following topics have been focused :
1) Influence of particle diameter on surface silanol structure, hydration force, and aggregation behavior of alkoxide-derived silica particles
2) Effect of anionic polymer dispersant structure and content on dense alumina suspension viscosity analyzing with the electrosteric interaction of polymer dispersant by AFM and colloid probe AFM under different counter-ion densities
3) Analysis of anionic polymer dispersant behavior in dense silicon nitride suspensions with and without oxide additives by using AFM and colloid probe AFM
4) Effect of anionic polymer dispersant structure and aggregation behavior on dense silicon carbide suspension characteristics and slip-casted green body structure
5) Control of microstructure and surface behavior of silica gel prepared from metal oxide
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