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In Situ Characterization of Spinel Nanoceramic Suspensions
Article first published online: 30 JUL 2012
© 2012 The American Ceramic Society
Journal of the American Ceramic Society
Volume 95, Issue 10, pages 3103–3108, October 2012
How to Cite
Kadosh, T., Cohen, Y., Talmon, Y., Kaplan, W. D. (2012), In Situ Characterization of Spinel Nanoceramic Suspensions. Journal of the American Ceramic Society, 95: 3103–3108. doi: 10.1111/j.1551-2916.2012.05360.x
- Issue published online: 2 OCT 2012
- Article first published online: 30 JUL 2012
- Manuscript Accepted: 13 JUN 2012
- Manuscript Received: 22 FEB 2012
- Rafael Ltd
- Technion Russell Berrie Nanotechnology Institute (RBNI)
In this study, an approach to characterize ceramic colloidal suspensions has been developed, based on vitrification of aqueous ceramic suspensions and microstructural characterization using cryogenic-temperature scanning electron microscopy (cryo-SEM), augmented by conventional rheological measurements. The flocculation phenomenon in as-milled and aged Mg-spinel (MgAl2O4) aqueous suspensions was characterized. A microstructure based on hard particle agglomerates separated by long-chain deflocculant molecules was directly observed, and correlated to the rheological properties of the suspension. Several levels of flocculation were detected as a function of suspension preparation conditions. Although suspensions at solid-loading levels appropriate for ceramic processing cannot be characterized using conventional particle size measurement techniques, cryo-SEM can be used to measure characteristic sizes, and to distinguish between agglomerated and flocculated particles, opening a new approach for optimizing solid-loading conditions for slip casting in terms of viscosity and green density.