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Porous cobalt spheres for high temperature gradient magnetically assisted fluidized beds
James E Atwater1, James R Akse, Goran N Jovanovic
1UMPQUA Research Company, P.O. Box 609, Myrtle Creek, OR 97457, USA. jatwater@urcmail.net
Materials Research Bulletin
|February 27, 2004
Summary
Researchers created porous metallic cobalt spheres for high-temperature magnetic fluidization and filtration. These cobalt spheres offer tunable porosity for advanced material applications.
Area of Science:
- Materials Science
- Chemical Engineering
- Magnetism
Background:
- Development of advanced materials for high-temperature applications is crucial.
- Magnetic fluidization and filtration technologies require robust media.
- Porous metallic cobalt spheres offer unique magnetic and physical properties.
Purpose of the Study:
- To synthesize porous metallic cobalt spheres.
- To evaluate their suitability for high-temperature magnetic fluidization and filtration.
- To control porosity through optimized processing.
Main Methods:
- Preparation of cobalt-impregnated alginate beads.
- Thermal decomposition of polymer to cobalt oxide spheres.
- Reduction to metallic cobalt and densification.
- Characterization using SEM, nitrogen adsorption, and VSM.
Main Results:
- Successfully synthesized porous metallic cobalt spheres.
- Achieved tunable porosity (10-50%) by adjusting sintering conditions.
- Demonstrated magnetic properties suitable for the intended applications.
Conclusions:
- Porous metallic cobalt spheres are viable high-temperature media.
- The synthesis method allows for controlled porosity.
- These spheres show promise for gradient magnetically assisted fluidization and filtration.