Microstructural Evolution of Nanoparticle Aqueous Colloidal Suspensions During Freeze Casting

This study is focused on the microstructural evolution of Al2O3 nanoparticle aqueous suspension during freeze casting. Freeze casting aid glycerol plays an important role in avoiding large cleavage‐type fracture while undesirably lowering nanoparticle packing for freeze‐cast samples. “Fines” effect...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2007-12, Vol.90 (12), p.3753-3758
Main Author: Lu, Kathy
Format: Article
Language:English
Subjects:
Applied sciences
Aqueous chemistry
Aqueous solutions
Building materials. Ceramics. Glasses
Ceramic industries
Ceramics
Chemical industry and chemicals
Chemistry
Colloidal state and disperse state
Emulsions and suspensions
Emulsions. Microemulsions. Foams
Exact sciences and technology
General and physical chemistry
General studies
Microstructure
Nanoparticles
Technical ceramics
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Summary:This study is focused on the microstructural evolution of Al2O3 nanoparticle aqueous suspension during freeze casting. Freeze casting aid glycerol plays an important role in avoiding large cleavage‐type fracture while undesirably lowering nanoparticle packing for freeze‐cast samples. “Fines” effect influences freeze‐cast surface nanoparticle packing. Trapped air bubbles in the suspension result in porous bulk microstructures if not allowed to escape from the suspension before freezing by prerest. Maintaining relatively open surface nanoparticle packing before freezing is critical in removing the air bubbles and achieving dense microstructures after freeze casting.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2007.02000.x